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9,342 results on '"[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]"'

1. Cu segregation in Au–Cu nanoparticles exposed to hydrogen atmospheric pressure: how is fcc symmetry maintained?

Author: Q. Wang, A. Nassereddine, D. Loffreda, C. Ricolleau, D. Alloyeau, C. Louis, L. Delannoy, J. Nelayah, H. Guesmi, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Université de Montpellier (UM), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire de Chimie - UMR5182 (LC), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Réactivité de Surface (LRS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and ANR-17-CE07-0031,TOTEM,Microscopie Électronique en Transmission Operando et Résolue en Temps pour la Catalyse Hétérogène(2017)
Subjects: [PHYS]Physics [physics], [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [CHIM]Chemical Sciences, [CHIM.CATA]Chemical Sciences/Catalysis, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Physical and Theoretical Chemistry
Abstract: International audience; In a recent work [A. Nassereddine et al., Small 2021, 17, 2104571] we reported the atomic-scale structure and dynamics of sub-4 nm sized Au nanoparticles (NPs) supported on titania in H2 at atmospheric pressure obtained by using aberration-corrected environmental transmission electron microscopy (ETEM), density functional theory (DFT) optimizations and ab initio molecular dynamic (AIMD) simulations. Our results showed unstable Au NPs losing their face-centred cubic (fcc) symmetry (from fcc to non-fcc symmetries) and revealed the drastic effect of hydrogen adsorption. In this work, we use the same approach to study the dynamics of equiatomic Au–Cu NPs in the same range of size and the results show an enhanced structural stability upon alloying by Cu. In spite of the morphology evolution from facetted to rounded shapes, the observed Au–Cu NPs are found to keep their fcc symmetry under atmospheric hydrogen pressure. AIMD simulation evidences a Cu segregation process from the sub-surface toward the upper surface layer, and a reversed segregation of Au atoms from the surface towards the sub-surface sites. The analysis of the chemical ordering in the core shows a tendency to a local chemical ordering where Au–Cu hetero-atomic bindings are favoured. The segregating Cu seems to play a major role in reducing the fluxionality of Au–Cu NPs in H2 and thus, maintaining their fcc symmetry.
Published: 2023

2. Interplay between interdiffusion and shape transformations in nanoalloys evolving from core–shell to intermixed structures

Author: Diana Nelli, Christine Mottet, Riccardo Ferrando, Università degli studi di Genova = University of Genoa (UniGe), Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), and Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [CHIM.MATE]Chemical Sciences/Material chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [CHIM.INOR]Chemical Sciences/Inorganic chemistry, Physical and Theoretical Chemistry
Abstract: International audience; Nanoalloys are often grown or synthesized in non-equilibrium configurations whose further evolution towards equilibrium can take place through complex pathways. In this work, we consider bimetallic systems with tendency towards intermixing, namely AgAu, PtPd and AuCu. We analyze their evolution starting from non-equilibrium initial configurations, such as phase-separated core@shell ones, by means of molecular dynamics (MD) simulations. These systems present some differences, since AuCu bulk alloys make ordered phases at low temperature whereas AgAu and PtPd remain in solid solution. Moreover, Cu, Au and Ag have similar cohesive energies whereas Pt is much more cohesive than Pd. We consider both truncated octahedral and icosahedral initial shapes in the size range between 2 and 3 nm. For each AB system, we consider both A@B and B@A core@shell starting configurations. The evolution is characterized by monitoring the time-dependent degree of intermixing and the evolution of the shape. The simulations are performed up to temperatures close to the melting range. The approach to thermodynamic equilibrium is monitored by MD simulations and compared with the equilibrium chemical configurations obtained by Monte Carlo simulations.
Published: 2023

3. Les verres, quel désordre ?

Author: Cormier, Laurent, Neuville, Daniel, Propriétés des amorphes, liquides et minéraux [IMPMC] (IMPMC_PALM), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), and Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: General Medicine, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: L’absence d’ordre à longue distance, par opposition à l’état cristallin, et le phénomène de la transition vitreuse sont les principaux critères qui distinguent le verre des autres états de la matière. Dans cet article, nous revenons sur les notions d’ordre et de désordre, de périodicité, et sur les différentes échelles d’organisation, en comparant les structures les plus ordonnées (les cristaux) avec celles des matériaux amorphes. Nous faisons un état des lieux sur la compréhension actuelle de la structure des verres, en montrant les avancées récentes issues de techniques expérimentales, révélant que cette structure est plus complexe que la vision traditionnelle d’un matériau désordonné homogène.
Published: 2022

4. Visualizing Giant Ferroelectric Gating Effects in Large-Scale WSe2/BiFeO3 Heterostructures

Author: Raphaël Salazar, Sara Varotto, Céline Vergnaud, Vincent Garcia, Stéphane Fusil, Julien Chaste, Thomas Maroutian, Alain Marty, Frédéric Bonell, Debora Pierucci, Abdelkarim Ouerghi, François Bertran, Patrick Le Fèvre, Matthieu Jamet, Manuel Bibes, Julien Rault, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES), THALES [France]-Centre National de la Recherche Scientifique (CNRS), SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Centre de Nanosciences et de Nanotechnologies (C2N), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de photonique et de nanostructures (LPN), ANR-18-CE24-0007,MAGICVALLEY,Polarisation de vallée induite par couplage d'échange magnétique dans les matériaux 2D à grande échelle(2018), and ANR-18-CE24-0015,CORNFLAKE,Contrôle ferroélectrique du couplage spin-orbite dans les dichalcogenides de métaux de transition(2018)
Subjects: perovskite oxides, Condensed Matter - Materials Science, Strongly Correlated Electrons (cond-mat.str-el), quantum materials, Mechanical Engineering, ferroelectrics, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Bioengineering, General Chemistry, Condensed Matter Physics, Condensed Matter - Strongly Correlated Electrons, heterostructures, transition-metal dichalcogenides, General Materials Science, angle-resolved photoemission spectroscopy, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: International audience; Multilayers based on quantum materials (complex oxides, topological insulators, transition-metal dichalcogenides, etc.) have enabled the design of devices that could revolutionize microelectronics and optoelectronics. However, heterostructures incorporating quantum materials from different families remain scarce, while they would immensely broaden the range of possible applications. Here we demonstrate the large-scale integration of compounds from two highly multifunctional families: perovskite oxides and transition-metal dichalcogenides (TMDs). We couple BiFeO 3 , a room-temperature multiferroic oxide, and WSe 2 , a semiconducting two-dimensional material with potential for photovoltaics and photonics. WSe 2 is grown by molecular beam epitaxy and transferred on a centimeter-scale onto BiFeO 3 films. Using angle-resolved photoemission spectroscopy, we visualize the electronic structure of 1 to 3 monolayers of WSe 2 and evidence a giant energy shift as large as 0.75 eV induced by the ferroelectric polarization direction in the underlying BiFeO 3. Such a strong shift opens new perspectives in the efficient manipulation of TMD properties by proximity effects.
Published: 2022

5. Unified non-equilibrium simulation methodology for flow through nanoporous carbon membrane

Author: Monet, Geoffrey, Bocquet, Marie-Laure, Bocquet, Lydéric, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), and European Project: 899528 ,ITS-THIN
Subjects: Nanotubes, Condensed Matter - Mesoscale and Nanoscale Physics, Energy harvesting, Desalination, Classical molecular dynamic simulations, FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, 2D materials, [PHYS.PHYS.PHYS-COMP-PH]Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph], Chemical elements, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Soft Condensed Matter (cond-mat.soft), Electrokinetic phenomena, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Graphene, Electroosmosis, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Nanomaterials
Abstract: The emergence of new nanoporous materials, based e.g. on 2D materials, offers new avenues for water filtration and energy. There is accordingly a need to investigate the molecular mechanisms at the root of the advanced performances of these systems in terms of nanofluidic and ionic transport. In this work, we introduce a novel unified methodology for Non-Equilibrium classical Molecular Dynamic simulations (NEMD), allowing to apply likewise pressure, chemical potential and voltage drops across nanoporous membranes and quantifying the resulting observables characterizing confined liquid transport under such external stimuli. We apply the NEMD methodology to study a new type of synthetic Carbon NanoMembranes (CNM), which have recently shown outstanding performances for desalination, keeping high water permeability while maintaining full salt rejection. The high water permeance of CNM, as measured experimentally, is shown to originate in prominent entrance effects associated with negligible friction inside the nanopore. Beyond, our methodology allows to fully calculate the symmetric transport matrix and the cross-phenomena such as electro-osmosis, diffusio-osmosis, streaming currents, etc. In particular, we predict a large diffusio-osmotic current across the CNM pore under concentration gradient, despite the absence of surface charges. This suggests that CNMs are outstanding candidates as alternative, scalable membranes for osmotic energy harvesting., Comment: 13 pages, 16 figures, submitted to J. Chem Phys
Published: 2023

6. The deformed Inozemtsev spin chain

Author: Klabbers, Rob, Lamers, Jules, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: High Energy Physics - Theory, Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), High Energy Physics - Theory (hep-th), Nonlinear Sciences - Exactly Solvable and Integrable Systems, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], FOS: Physical sciences, Mathematical Physics (math-ph), [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Exactly Solvable and Integrable Systems (nlin.SI), Mathematical Physics
Abstract: We present two new quantum-integrable models with long-range spin interactions. First, a partially isotropic (xxz-type) spin chain that unifies the Inozemtsev and partially isotropic Haldane-Shastry chains. It has important implications even for the isotropic Inozemtsev chain. Its short-range limit is a twisted Heisenberg xxz chain. Second, a quantum many-body system with spins that generalises the elliptic Ruijsenaars model using dynamical R-matrices. It unifies the elliptic spin-Calogero-Sutherland and trigonometric spin-Ruijsenaars-Macdonald models, and gives our spin chain by 'freezing'., v1: 8 pages, 1 figure; v2-3: minor changes
Published: 2023

7. Fano factor, $\Delta T$-noise and cross-correlations in double quantum dots

Author: Crépieux, A., Duong, T. Q., Lavagna, M., Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)
Subjects: Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: We present a theoretical study of electrical current fluctuations and finite-frequency noise in a double quantum dot connected to two electron reservoirs with the aim of deriving the Fano factor, the $\Delta T$-noise and the cross-correlations. This allows one to highlight several interesting features. Firstly the possibility of getting a significant reduction of current noise and Fano factor either when the system is placed in a given operating regime, or when a temperature gradient is applied between the two reservoirs, resulting from the fact that a negative $\Delta T$-noise is generated. The second feature is the sign change found in the cross-correlator between the two reservoirs with increasing frequencies. This study clarifies the understanding of the results obtained experimentally in such systems., Comment: 5 pages, 6 figures
Published: 2023

8. A solvable model for graph state decoherence dynamics

Author: Houdayer, Jérôme, Landa, Haggai, Misguich, Grégoire, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), IBM Research [HAIFA], and IBM R&D Labs in Israel
Subjects: [PHYS]Physics [physics], entropy, entanglement, Quantum Physics, toy model, FOS: Physical sciences, master equation, dissipation, Hamiltonian, Condensed Matter - Other Condensed Matter, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], quantum information, Pauli, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Quantum Physics (quant-ph), decoherence, qubit, Other Condensed Matter (cond-mat.other)
Abstract: We present an exactly solvable toy model for the continuous dissipative dynamics of permutation-invariant graph states of N qubits. Such states are locally equivalent to an N-qubit Greenberger-Horne-Zeilinger (GHZ) state, a fundamental resource in many quantum information processing setups. We focus on the time evolution of the state governed by a Lindblad master equation with the three standard single-qubit jump operators, the Hamiltonian part being set to zero. Deriving analytic expressions for the expectation values of observables expanded in the Pauli basis at all times, we analyze the nontrivial intermediate-time dynamics. Using a numerical solver based on matrix product operators we simulate the time evolution for systems with up to 64 qubits and verify a numerically exact agreement with the analytical results. We find that the evolution of the operator space entanglement entropy of a bipartition of the system manifests a plateau whose duration increases logarithmically with the number of qubits, whereas all Pauli-operator products have expectation values decaying at most in constant time., Comment: 14 pages, 10 figures
Published: 2023

9. Room-temperature magnetoelectric effect in lead-free multiferroic $(1-x)$ Ba$_{0.95}$Ca$_{0.05}$Ti$_{0.89}$Sn$_{0.11}$O$_3$-$(x)$CoFe$_2$O$_4$ particulate composites

Author: Hadouch, Youness, Mezzane, Daoud, Amjoud, M Barek, Oueldna, Nouredine, Gagou, Yaovi, Kutnjak, Zdravko, Laguta, Valentin, Kopelevich, Yakov, Hoummada, Khalid, Marssi, Mimoun El, Université Cadi Ayyad [Marrakech] (UCA), Laboratoire de Physique de la Matière Condensée - UR UPJV 2081 (LPMC), Université de Picardie Jules Verne (UPJV), Laboratoire des Matériaux Innovants, Energie et Développement Durable [Marrakech] (IMED-Lab ), Faculté des Sciences et Techniques Marrakech (FSTG), Université Cadi Ayyad [Marrakech] (UCA)-Université Cadi Ayyad [Marrakech] (UCA), Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Jozef Stefan Institute [Ljubljana] (IJS), Institute for Problems of Material Science, National Academy of Sciences of Ukraine (NASU), Institute of Physics ASCR, Institute of Physics of the Czech Academy of Sciences (FZU / CAS), Czech Academy of Sciences [Prague] (CAS)-Czech Academy of Sciences [Prague] (CAS), and Universidade Estadual de Campinas = University of Campinas (UNICAMP)
Subjects: Condensed Matter - Materials Science, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: Multiferroic particulate composites $(1-x)$ Ba$_{0.95}$Ca$_{0.05}$Ti$_{0.89}$Sn$_{0.11}$O$_3$-$(x)$CoFe$_2$O$_4$ with ($x$ = 0.1, 0.2, 0.3, 0.4 and 0.5) have been prepared by mechanical mixing of the calcined and milled individual ferroic phases. X-ray diffraction and Raman spectroscopy analysis confirmed the formation of both perovskite Ba$_{0.95}$Ca$_{0.05}$Ti$_{0.89}$Sn$_{0.11}$O$_3$ (BCTSn) and spinel CoFe$_2$O$_4$ (CFO) phases without the presence of additional phases. The morphological properties of the composites were provided by using Field Emission Scanning Electron Microscopy. The BCTSn-CFO composites exhibit multiferroic behavior at room temperature, as evidenced by ferroelectric and ferromagnetic hysteresis loops. The magnetoelectric (ME) coupling was measured under a magnetic field up to 10 kOe and the maximum ME response found to be 0.1 mV /cm/ Oe for the composition 0.7 BCTSn-0.3 CFO exhibiting a high degree of pseudo-cubicity and large density.
Published: 2023

10. From Lindblad master equations to Langevin dynamics and back

Author: Coppola, Michele, Daouma, Zoubair, Henkel, Malte, Laboratoire de Physique et Chimie Théoriques (LPCT), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), and Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: Quantum Physics, Statistical Mechanics (cond-mat.stat-mech), [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], FOS: Physical sciences, Mathematical Physics (math-ph), [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Quantum Physics (quant-ph), Condensed Matter - Statistical Mechanics, Mathematical Physics
Abstract: A case study of the non-equilibrium dynamics of open quantum systems in the markovian approximation is presented for two dynamical models based on a single harmonic oscillator in an external field. Specified through distinct forms of ohmic damping, their quantum Langevin equations are derived from an identical set of physical criteria, namely the canonical commutator between position and momentum, the Kubo formula, the virial theorem and the quantum equilibrium variance. The associated Lindblad equations are derived but only one of them is completely positive. Transforming those into Fokker-Planck equations for the Wigner functions, both models are shown to evolve towards the same Gibbs state, for a vanishing external field. The phenomenological differences between the models are illustrated through their quantum relaxations and through the phase diagrammes derived from their re-interpretation as mean-field approximations of an interacting many-body system., Comment: 4 figures
Published: 2023

11. Infrared nanoplasmonic properties of hyperdoped embedded Si nanocrystals in the few electrons regime

Author: Meiling Zhang, Jean-Marie Poumirol, Nicolas Chery, Clément Majorel, Rémi Demoulin, Etienne Talbot, Hervé Rinnert, Christian Girard, Fuccio Cristiano, Peter R. Wiecha, Teresa Hungria, Vincent Paillard, Arnaud Arbouet, Béatrice Pécassou, Fabrice Gourbilleau, Caroline Bonafos, Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Groupe de physique des matériaux (GPM), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Équipe Matériaux et Procédés pour la Nanoélectronique (LAAS-MPN), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Centre de microcaractérisation Raimond Castaing (Centre Castaing), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Nanomatériaux, Ions et Métamatériaux pour la Photonique (NIMPH), ANR-18-CE09-0034,DONNA,Dopage à l'échelle nano(2018), and ANR-21-CE30-0042,Ti-P,Plasmons de surfaces non réciproques induit par la topologie(2021)
Subjects: Condensed Matter - Materials Science, Physics::Optics, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, semiconductor-based plasmonic, Atomic and Molecular Physics, and Optics, green dyadic method, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, Physics::Atomic and Molecular Clusters, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], silicon nanocrystals, plasmon hybridization, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Electrical and Electronic Engineering, Physics - Optics, Optics (physics.optics), few electrons regime, Biotechnology
Abstract: Using localized surface plasmon resonance (LSPR) as an optical probe we demonstrate the presence of free carriers in phosphorus doped silicon nanocrystals (SiNCs) embedded in a silica matrix. In small SiNCs, with radius ranging from 2.6 to 5.5 nm, the infrared spectroscopy study coupled to numerical simulations allows us to determine the number of electrically active phosphorus atoms with a precision of a few atoms. We demonstrate that LSP resonances can be supported with only about 10 free electrons per nanocrystal, confirming theoretical predictions and probing the limit of the collective nature of plasmons. We reveal the appearance of an avoided crossing behavior linked to the hybridization between the localized surface plasmon in the doped nanocrystals and the silica matrix phonon modes. Finally, a careful analysis of the scattering time dependence versus carrier density in the small size regime allows us to detect the appearance of a new scattering process at high dopant concentration, which can be explained by P clustering inside the SiNCs.
Published: 2022

12. Nanocrystal-Based Active Photonics Device through Spatial Design of Light-Matter Coupling

Author: Tung Huu Dang, Adrien Khalili, Claire Abadie, Charlie Gréboval, Mariarosa Cavallo, Huichen Zhang, Erwan Bossavit, James K. Utterback, Erwan Dandeu, Yoann Prado, Gregory Vincent, Sandrine Ithurria, Yanko Todorov, Carlo Sirtori, Angela Vasanelli, Emmanuel Lhuillier, QUAD : Physique Quantique et Dispositifs, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Acoustique pour les nanosciences (INSP-E3), Nanostructures et optique (INSP-E4), DOTA, ONERA, Université Paris Saclay [Palaiseau], ONERA-Université Paris-Saclay, Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), ANR-21-CE09-0029,MixDFerro,Heterostructures à dimensions mixtes sous contrôle ferroélectrique 2D(2021), ANR-20-ASTR-0008,NITquantum,Design et fabrication d'un plan focal dans le proche infrarouge à base de nanocrisrtaux(2020), ANR-21-CE24-0012,BRIGHT,Diode électroluminescente infrarouge brillante par exaltation du couplage lumière-matière(2021), and European Project: 756225,blackQD
Subjects: MOBILITE, INFRAROUGE, Atomic and Molecular Physics, and Optics, CHAMP ELECTROMAGNETIQUE, PHOTONIQUE, Electronic, Optical and Magnetic Materials, active photonics, nanocrystals, infrared, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, RADIATION, light matter coupling, SEMICONDUCTEUR, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Electrical and Electronic Engineering, carrier mobility, Biotechnology
Abstract: International audience; Integration of photonic structures in nanocrystal-based photodetectors has been demonstrated to improve device performances. Furthermore, bias-dependent photoresponse can be observed in such devices as a result of the interplay between hopping transport and inhomogeneous electromagnetic field. Here, we investigate the main physical concepts leading to a voltage-dependent photoresponse. We first bring evidence of bias-dependent carrier mobilities in a nanocrystal array over a wide range of temperatures. Then, we realize an infrared sensing device using HgTe nanocrystals, where the electrodes also play the role of a grating, inducing a spatially inhomogeneous absorption. The obtained device exhibits a significant bias-dependent photoresponse while possessing a competitive detection performance in the extended shortwave and mid-wave infrared, with detectivity reaching 7x10 10 Jones at 80 K and a fast response time of around 70 ns. This work provides the foundation for further advancements in nanocrystal-basedactive photonics devices.
Published: 2022

13. Cathodic control using cellular automata approach

Author: Mariem Zenkri, Dung di Caprio, Fayçal Raouafi, Damien Féron, Laboratoire de Physicochimie des Matériaux - IPEST(La Marsa, Tunisia), Institut préparatoire aux études scientifiques et techniques [La Marsa] (IPEST), Institut de Recherche de Chimie Paris (IRCP), Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture (MC), Faculté des Sciences de Bizerte [Université de Carthage], Université de Carthage - University of Carthage, Chimie Moléculaire de Paris Centre (FR 2769), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), Département de Physico-Chimie (DPC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: corrosion, cellular automata, Mechanical Engineering, Metals and Alloys, General Medicine, cathodic control, Surfaces, Coatings and Films, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Mechanics of Materials, dissolved oxygen, Materials Chemistry, Environmental Chemistry, passivation, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: International audience; We present a stochastic three dimensional cellular automata model of aqueous corrosion. We consider the cathodic reaction with dissolved oxygen and different concentrations of the oxidizer. We study the role and the stability of the passive layer and its effect on the kinetics, surface morphology and roughness of the metallic surface. The model considers balanced spatially separated anodic and cathodic reactions and is capable of illustrating the cathodic control of the corrosion rate. Besides the electrochemical reactions, we take into account ionic diffusion, acido/basic neutralization. Results are compared to aqueous corrosion of Fe in near neutral solution.
Published: 2022

14. Swift heavy ions irradiation of water ice at different temperatures: hydrogen peroxide and ozone synthesis and sputtering yield

Author: C Mejía, A L F de Barros, H Rothard, P Boduch, E F da Silveira, Facultad de Ciencias Químicas, Departamento de Física, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Atomes, Molécules et Agrégats (AMA), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro
Subjects: Space and Planetary Science, Astronomy and Astrophysics, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: Water ices at 15 and 144 K were bombarded by swift heavy ions, 45.8 MeV 58Ni11 + and 606 MeV 64Zn26 +, to measure the induced chemical and physical effects. The column densities of water and the synthesized species, hydrogen peroxide (H2O2) and ozone (O3), were monitored via infrared spectroscopy. The formation and destruction cross-sections of precursor and products were determined and compared with literature. The H2O2 formation and destruction cross-sections reveal a linear dependence with electronic stopping power, σ ∝ Se. The sputtering yield (Y0) shows a power law with electronic energy lost, $Y_0\propto S_\mathrm{e}^2$, and an exponential increase with the sample temperature. The findings indicate that the radiolysis rate of water ice is higher at low temperatures while the desorption yield increases at higher temperatures. A large amount of water ice is located in the grain mantles of the circumstellar envelopes and the interstellar medium regions, which are exposed to galactic cosmic rays (GCRs). The synthesis of H2O2 and O3 molecules as a function of absorbed doses of GCR irradiation and their irradiation time is analysed in detail. Besides, the extrapolation of the sputtering yield rates, as a function of time and temperature, for astrophysical conditions can contribute to a better understanding of non-thermal sputtering of water ices.
Published: 2022

15. Nanostructured BaTi1-xSnxO3 ferroelectric materials for electrocaloric applications and energy performance

Author: M. Benyoussef, T. Mura, S. Saitzek, F. Azrour, J.-F. Blach, A. Lahmar, Y. Gagou, M. El Marssi, A. Sayede, M. Jouiad, Laboratoire de Physique de la Matière Condensée - UR UPJV 2081 (LPMC), Université de Picardie Jules Verne (UPJV), UCCS Équipe Couches Minces & Nanomatériaux, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: General Physics and Astronomy, General Materials Science, [CHIM.MATE]Chemical Sciences/Material chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: International audience; Nanostructured BaTi1-xSnxO3 (x = 0, 0.05 & 0.075) were successfully synthesized using the modified Pechini processing method. The phase purity and symmetry were examined by X-ray diffraction and Raman spectroscopy. Tetragonal symmetry was obtained for BaTiO3 (BT) while orthorhombic symmetry for Sn doped BT. BT exhibits an up-shift of the Curie temperature towards high temperatures (TC = 139 °C). In contrast, a down-shift was recorded for Sn doped BT. Then, indirect electrocaloric (EC) adiabatic temperature change ΔT and the energy storage performances were determined based on ferroelectric hysteresis loops. Interestingly, large EC responsivity of ΔT/ΔE = 0.81 × 10−6 K m/V was obtained for the BT accompanied with a moderate stored energy of 23 mJ/cm3 but with a high energy efficiency of 67%. The incorporation of Sn in BT was found to broaden the EC responsivity and to improve the energy efficiency up to 90%, recorded for the 5% Sn doped BT.
Published: 2022

16. Breaking the chains: extreme value statistics and localization in random spin chains

Author: Colbois, Jeanne, Laflorencie, Nicolas, Laboratoire de Physique Théorique (LPT), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Condensed Matter - Strongly Correlated Electrons, Quantum Physics, Statistical Mechanics (cond-mat.stat-mech), Strongly Correlated Electrons (cond-mat.str-el), [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], FOS: Physical sciences, Disordered Systems and Neural Networks (cond-mat.dis-nn), Condensed Matter - Disordered Systems and Neural Networks, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Quantum Physics (quant-ph), Condensed Matter - Statistical Mechanics
Abstract: Despite a very good understanding of single-particle Anderson localization in one-dimensional (1D) disordered systems, many-body effects are still full of surprises, a famous example being the interaction-driven many-body localization (MBL) problem, about which much has been written, and perhaps the best is yet to come. Interestingly enough the non-interacting limit provides a natural playground to study non-trivial multiparticle physics, offering the possibility to test some general mechanisms with very large-scale exact diagonalization simulations. In this work, we first revisit the 1D many-body Anderson insulator through the lens of extreme value theory, focusing on the extreme polarizations of the equivalent spin chain model in a random magnetic field. A many-body-induced chain breaking mechanism is explored numerically, and compared to an analytically solvable toy model. A unified description, from weak to large disorder strengths $W$ emerges, where the disorder-dependent average localization length $\xi(W)$ governs the extreme events leading to chain breaks. In particular, tails of the local magnetization distributions are controlled by $\xi(W)$. Remarkably, we also obtain a quantitative understanding of the full distribution of the extreme polarizations, which is given by a Fr\'echet-type law. In a second part, we explore finite interaction physics and the MBL question. For the available system sizes, we numerically quantify the difference in the extreme value distributions between the interacting problem and the non-interacting Anderson case. Strikingly, we observe a sharp "extreme-statistics transition" as $W$ changes, which may coincide with the MBL transition., Comment: 18 + 6 pages; 13 + 4 figures
Published: 2023

17. Strange metallicity in an antiferromagnetic quantum critical model: A sign-problem-free quantum Monte-Carlo study

Author: Teixeira, Rafael M. P., Pépin, Catherine, Freire, Hermann, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: We compute transport and thermodynamic properties of a two-band spin-fermion model describing itinerant fermions in two dimensions interacting via $Z_2$ antiferromagnetic quantum critical fluctuations by means of a sign-problem-free quantum Monte-Carlo approach. We show that the phase diagram of this model indeed contains a $d$-wave superconducting phase at low enough temperatures. However, a crucial question that arises is whether a non-Fermi-liquid metallic regime exists above $T_c$ exhibiting hallmark strange-metal transport phenomenology. Interestingly, we find that this version of the model describes a non-Fermi-liquid metallic regime that displays an approximately $T$-linear resistivity above $T_c$ for a strong fermion-boson interaction. Using Nernst-Einstein relation, our QMC results also show that this strange metal phase exhibits a crossover from being characterized by a charge compressibility given approximately by $\chi_{c}\sim 1/T$ at high temperatures to being described by a charge diffusivity consistent with the scaling $D_{c}\sim 1/T$ at low temperatures. Therefore, our work adds support to the view that the $Z_2$ antiferromagnetic spin-fermion model at strong coupling can be considered a minimal model that describes both unconventional superconductivity and strange metallicity, which are fundamentally interconnected in many important strongly-correlated quantum materials., Comment: 11 pages, 8 figures
Published: 2023

18. The basics of electron transport in spintronics: textbook with lectures, exercises and solutions

Author: Vincent Baltz, SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)
Subjects: [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: International audience; Here is the ideal book to grasp the basic concepts of spin-dependent electron transport and to develop a deep physical understanding of the subject. A careful selection of key notions provides a concise and effective framework. Learning how to use these notions is successfully supported by ten extended exercises with complete solutions. Common terms and specialist jargon are clearly explained, and the way in which subtleties complicate phenomena, without altering their physical basis, is pedagogically addressed. The rigorous and harmonised system of notation and units adopted throughout the book allows the reader to navigate easily between concepts and to gain a broad view of the subject. Based on a series of lectures given to MSc and PhD students, this book will appeal to a wide range of readers, from students at the graduate level to researchers and engineers. The present extract contains the front cover, the foreword, the preface, and the table of contents.
Published: 2023

19. Resilient infinite randomness criticality for a disordered chain of interacting Majorana fermions

Author: Chepiga, Natalia, Laflorencie, Nicolas, Laboratoire de Physique Théorique (LPT), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Condensed Matter - Strongly Correlated Electrons, Quantum Physics, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Statistical Mechanics (cond-mat.stat-mech), Strongly Correlated Electrons (cond-mat.str-el), FOS: Physical sciences, Disordered Systems and Neural Networks (cond-mat.dis-nn), [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter - Disordered Systems and Neural Networks, Quantum Physics (quant-ph), Condensed Matter - Statistical Mechanics
Abstract: The quantum critical properties of interacting fermions in the presence of disorder are still not fully understood. While it is well known that for Dirac fermions, interactions are irrelevant to the non-interacting infinite randomness fixed point (IRFP), the problem remains largely open in the case of Majorana fermions which further display a much richer disorder-free phase diagram. Here, pushing the limits of DMRG simulations, we carefully examine the ground-state of a Majorana chain with both disorder and interactions. Building on appropriate boundary conditions and key observables such as entanglement, energy gap, and correlations, we strikingly find that the non-interacting Majorana IRFP is very stable against finite interactions, in contrast with previous claims., 5+2 pages, 5+4 figures
Published: 2023

20. Carrier-Density Control of the Quantum-Confined 1$T$-TiSe$_2$ Charge-Density-Wave

Author: Jaouen, T., Pulkkinen, A., Rumo, M., Kremer, G., Salzmann, B., Nicholson, C. W., Mottas, M. -L., Giannini, E., Tricot, S., Schieffer, P., Hildebrand, B., Monney, C., Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Department of Physics [Fribourg], Université de Fribourg = University of Fribourg (UNIFR), Fribourg Center for Nanomaterials (FriMat), University of West Bohemia [Plzeň ], Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Max Planck Society, Department of Quantum Matter Physics [Geneva] (DQMP), Université de Genève = University of Geneva (UNIGE), and This project was supported by the Fonds National Suisse pour la Recherche Scientifique through Div. II. Skillful technical assistance was provided by F. Bourqui, B. Hediger, and O. Raetzo.
Subjects: Superconductivity (cond-mat.supr-con), [PHYS]Physics [physics], Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), Condensed Matter - Superconductivity, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: Using angle-resolved photoemission spectroscopy, combined with first principle and coupled self-consistent Poisson-Schr\"odinger calculations, we demonstrate that potassium (K) atoms adsorbed on the low-temperature phase of 1$T$-TiSe$_2$ induce the creation of a two-dimensional electron gas (2DEG) and quantum confinement of its charge-density-wave (CDW) at the surface. By further changing the K coverage, we tune the carrier-density within the 2DEG that allows us to nullify, at the surface, the electronic energy gain due to exciton condensation in the CDW phase while preserving a long-range structural order. Our study constitutes a prime example of a controlled exciton-related many-body quantum state in reduced dimensionality by alkali-metal dosing., Comment: 6 pages, 3 figures, accepted for publication in Physical Review Letters
Published: 2023

21. Classical fully-packed loop model with attractive interactions on the square lattice

Author: Dabholkar, Bhupen, Ran, Xiaoxue, Rong, Junchen, Yan, Zheng, Sreejith, G. J., Meng, Zi Yang, Alet, Fabien, Laboratoire de Physique Théorique (LPT), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Institut des Hautes Études Scientifiques (IHES), and IHES
Subjects: Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), Statistical Mechanics (cond-mat.stat-mech), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter - Statistical Mechanics
Abstract: We study a classical model of fully-packed loops on the square lattice, which interact through attractive loop segment interactions between opposite sides of plaquettes. This study is motivated by effective models of interacting quantum matter arising in frustrated magnets or Rydberg atom arrays, for which loop degrees of freedom appear at low energy. Through a combination of Monte Carlo simulations and an effective height field theory, we find that the critical point known to occur at infinite temperature gives rise to a high-temperature critical phase with floating exponents. At lower temperature, the system transitions via a Kosterlitz-Thouless phase transition to a nematic phase where lattice rotation symmetry is broken. We discuss consequences for the phase diagram of the quantum loop model on the same lattice., 10+2 pages, 6+3 figures
Published: 2023

22. From Early Theories of Dzyaloshinskii-Moriya Interactions in Metallic Systems to Today's Novel Roads

Author: Albert Fert, Mairbek Chshiev, André Thiaville, Hongxin Yang, Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES), THALES [France]-Centre National de la Recherche Scientifique (CNRS), SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), National Laboratory of Solid State Microstructures [Nanjing University] (LSSMS), Nanjing University (NJU), and European Project: 881603,H2020,H2020-SGA-FET-GRAPHENE-2019, GrapheneCore3(2020)
Subjects: Condensed Matter - Materials Science, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], General Physics and Astronomy, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: Since the early 1960's, the discovery of Dzyaloshinskii-Moriya interaction (DMI) helped to explain the physical mechanisms behind certain magnetic phenomena, such as net moment in antiferromagnets, or enhanced anisotropy field from heavy metals impurity in dilute Cu:Mn alloy. Since the researchers unveil the key role that DMI plays in stabilizing chiral Neel type magnetic domain wall and magnetic skyrmions, the studies on DMI have received growing interest. Governed by spin-orbit coupling (SOC) and various types of inversion symmetry breaking (ISB) in magnetic systems, DMI drives the forming of distinct morphologies of magnetic skyrmions. Our aim is to briefly introduce the research history of DMI and its significance in the field of modern spintronics., Published in J. Phys. Soc. Jpn
Published: 2023

23. Interfacial engineering of ferromagnetism in wafer-scale van der Waals Fe4GeTe2 far above room temperature

Author: Hangtian Wang, Haichang Lu, Zongxia Guo, Ang Li, Peichen Wu, Jing Li, Weiran Xie, Zhimei Sun, Peng Li, Héloïse Damas, Anna Maria Friedel, Sylvie Migot, Jaafar Ghanbaja, Luc Moreau, Yannick Fagot-Revurat, Sébastien Petit-Watelot, Thomas Hauet, John Robertson, Stéphane Mangin, Weisheng Zhao, Tianxiao Nie, Wang, Hangtian [0000-0003-2844-8635], Lu, Haichang [0000-0002-5831-2061], Li, Peng [0000-0001-8491-0199], Friedel, Anna Maria [0000-0002-7523-0375], Petit-Watelot, Sébastien [0000-0002-0697-8929], Hauet, Thomas [0000-0001-5637-0690], Mangin, Stéphane [0000-0001-6046-0437], Zhao, Weisheng [0000-0001-8088-0404], Nie, Tianxiao [0000-0001-9067-9931], Apollo - University of Cambridge Repository, Beihang University (BUAA), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), University of Cambridge [UK] (CAM), Auburn University (AU), Technische Universität Kaiserslautern (TU Kaiserslautern), W.Z., T.N., and H.L. acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 62274009, 61774013, and 12204027), the National Key R&D Program of China (Grant No. 2018YFB0407602), the International Collaboration Project (Grant No. B16001), and the National Key Technology Program of China (Grant No. 2017ZX01032101). This work was also supported by FEDER-FSE Lorraine et Massif des Vosges 2014–2020, a European Union Program (to T.H.). H.T. Wang thanks the support from the Academic Excellence Founda- tion of BUAA for PhD Students., and European Project
Subjects: Multidisciplinary, General Physics and Astronomy, General Chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 51 Physical Sciences, General Biochemistry, Genetics and Molecular Biology, 5108 Quantum Physics
Abstract: Despite recent advances in exfoliated vdW ferromagnets, the widespread application of 2D magnetism requires a Curie temperature (Tc) above room temperature as well as a stable and controllable magnetic anisotropy. Here we demonstrate a large-scale iron-based vdW material Fe4GeTe2 with the Tc reaching ~530 K. We confirmed the high-temperature ferromagnetism by multiple characterizations. Theoretical calculations suggested that the interface-induced right shift of the localized states for unpaired Fe d electrons is the reason for the enhanced Tc, which was confirmed by ultraviolet photoelectron spectroscopy. Moreover, by precisely tailoring Fe concentration we achieved arbitrary control of magnetic anisotropy between out-of-plane and in-plane without inducing any phase disorders. Our finding sheds light on the high potential of Fe4GeTe2 in spintronics, which may open opportunities for room-temperature application of all-vdW spintronic devices.
Published: 2023

24. Cyclic quantum engines enhanced by strong bath coupling

Author: Latune, Camille L., Pleasance, Graeme, Petruccione, Francesco, Laboratoire de Physique de l'ENS Lyon (Phys-ENS), and École normale supérieure de Lyon (ENS de Lyon)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Quantum Physics, Statistical Mechanics (cond-mat.stat-mech), [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Quantum Physics (quant-ph), Condensed Matter - Statistical Mechanics
Abstract: While strong system-bath coupling produces rich and interesting phenomena, applications to quantum thermal engines have been so far pointing mainly at detrimental effects. The delicate trade-off between efficiency loss due to strong coupling and power increase due to faster equilibration, while acknowledged, remained largely unexplored owing to the challenge of assessing precisely the equilibration time. Here, we overcome this obstacle by exploiting exact numerical simulations based on the hierarchical equations of motion (HEOM) formalism. We show that a quantum Otto cycle can perform better at strong (but not ultrastrong) coupling in that the product of the efficiency times the output power is maximized in this regime. In particular, we show that strong coupling allows one to obtain engines with larger efficiency than their weakly coupled counterparts, while sharing the same output power. Conversely, one can design strongly coupled engines with larger power than their weakly coupled counterparts, while sharing the same efficiency. Overall, our results provide situations where strong coupling can directly enhance the performance of thermodynamic operations, re-enforcing the importance of studying quantum thermal engines beyond standard configurations., 10 + 10 pages, 9 + 3 figures. Slight changes in the introduction. Comments are welcome
Published: 2023

25. Artificial Aging of Thin Films of the Indium-Free Transparent Conducting Oxide SrVO 3

Author: Martando Rath, Moussa Mezhoud, Oualyd El Khaloufi, Oleg Lebedev, Julien Cardin, Christophe Labbé, Fabrice Gourbilleau, Vincent Polewczyk, Giovanni Vinai, Piero Torelli, Arnaud Fouchet, Adrian David, Wilfrid Prellier, Ulrike Lüders, Laboratoire de cristallographie et sciences des matériaux (CRISMAT), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Nanomatériaux, Ions et Métamatériaux pour la Photonique (NIMPH), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), CNR Istituto Officina dei Materiali (IOM), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), and Laboratorio TASC (IOM CNR)
Subjects: [PHYS]Physics [physics], General Materials Science, [CHIM.MATE]Chemical Sciences/Material chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Published: 2023

26. Tensor network variational optimizations for real-time dynamics: application to the time-evolution of spin liquids

Author: Ponnaganti, Ravi Teja, Mambrini, Matthieu, Poilblanc, Didier, Laboratoire de Physique Théorique (LPT), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), Quantum Gases (cond-mat.quant-gas), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter - Quantum Gases
Abstract: Within the Projected Entangled Pair State (PEPS) tensor network formalism, a simple update (SU) method has been used to investigate the time evolution of a two-dimensional U(1) critical spin-1/2 spin liquid under Hamiltonian quench [Phys. Rev. B 106, 195132 (2022)]. Here we introduce two different variational frameworks to describe the time dynamics of SU(2)-symmetric translationally-invariant PEPS, aiming to improve the accuracy. In one approach, after using a Trotter-Suzuki decomposition of the time evolution operator in term of two-site elementary gates, one considers a single bond embedded in an environment approximated by a Corner Transfer Matrix Renormalization Group (CTMRG). A variational update of the two tensors on the bond is performed under the application of the elementary gate and then, after symmetrization of the site tensors, the environment is updated. In the second approach, a cluster optimization is performed on a finite (periodic) cluster, maximizing the overlap of the exact time-evolved state with a symmetric finite-size PEPS ansatz. Observables are then computed on the infinite lattice contracting the infinite-PEPS (iPEPS) by CTMRG. We show that the variational schemes outperform the SU method and remain accurate over a significant time interval before hitting the entanglement barrier. Studying the spectrum of the transfer matrix, we find that the asymptotic correlations are very well preserved under time evolution, including the critical nature of the singlet correlations, as expected from the Lieb-Robinson (LR) bound theorem. Consistently, the system (asymptotic) boundary is found to bedescribed by the same Conformal Field Theory of central charge c = 1 during time evolution. We also compute the time-evolution of the short distance spin-spin correlations and estimate the LR velocity., Comment: Minor revisions have been implemented following the suggestions provided by the referees
Published: 2023

27. ZnO nanowires based piezoelectric transducers: the role of size and semiconducting properties

Author: Jalabert, Thomas, Pusty, Manojit, Lopez Garcia, Andrés Jenaro, Cresti, Alessandro, Mouis, Mireille, Ardila, Gustavo, Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Ivo Rendina, Lucia Petti, Domenico Sagnelli, Giuseppe Nenna, ANR-20-CE09-0005,SCENIC,Effets de charges de surface dans les nanofils fonctionnalisés de GaN et ZnO : Etude et contrôle(2020), ANR-21-CE50-0026,LATINO,Effets électromécaniques non linéaires dans les nanofils de ZnO pour une conversion de l'énergie améliorée(2021), European Project: 863227,PULSE-COM, and European Project: 730957,ENABLES
Subjects: energy harvesting, Finite Element Method, nanowire, ZnO, piezoelectric coefficient, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Piezoresponse Force Microscopy
Abstract: International audience; Piezoelectric thin films are widely used in MEMS and NEMS actuators and resonators, but also in mechanical sensors and energy harvesters for IoT applications and Wireless Sensors Networks. Nanotechnology involving piezoelectric materials is a key research direction, with benefits expected from nanostructuring and the replacement of toxic materials. Piezoelectric nanocomposites based on semiconducting nanowires (NWs) are an alternative to thin films with nanostructuration benefits, such as low temperature fabrication and higher flexibility than thin films. In addition, they exhibit larger piezoelectric coefficient than their thin films counterparts. In this work we study the piezoelectric performance of vertically grown ZnO NWs based on Finite Element simulations in the PFM (Piezoresponse Force Microscopy) configuration. In this AFM (Atomic Force Microscope) mode, the AFM tip is placed in contact with the top surface of the NW while applying a voltage, thus inducing a deformation of the structure by the reverse piezoelectric effect. Different parameters are assessed: the effect of the surrounding air, the NW size and geometry and the effect of the semiconducting properties, in particular the doping level and surface traps density. The results are compared to previous theoretical approaches and experimental findings.
Published: 2023

28. Microcanonical windows on quantum operators

Author: Pappalardi, Silvia, Foini, Laura, Kurchan, Jorge, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut de Physique Théorique - UMR CNRS 3681 (IPHT), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: Quantum Physics, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Statistical Mechanics (cond-mat.stat-mech), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Quantum Physics (quant-ph), Condensed Matter - Statistical Mechanics
Abstract: We discuss a construction of a microcanonical projection WOW of a quantum operator O, its spectrum, and the retrieval of canonical many-time correlations from it., 18 pages, 4 figures
Published: 2023

29. Temperature-dependent anisotropy in bond length of UO2 as a result of phonon-induced correlations

Author: Desgranges, Lionel, Baldinozzi, Gianguido, Fischer, Henry, Lander, Gerard, CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département d'Etudes des Combustibles (DEC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire Structures, Propriétés et Modélisation des solides (SPMS), Institut de Chimie du CNRS (INC)-CentraleSupélec-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), European Commission - Joint Research Centre [Karlsruhe] (JRC), and The Max Planck Institute for Chemical Physics of Solids, Dresden
Subjects: [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [CHIM.CRIS]Chemical Sciences/Cristallography, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: International audience; Previous experiments on cubic UO2 have suggested that the temperature dependences of the nearest-neighbour U–O and U–U distances are different. We have acquired total-scattering neutron diffraction patterns out to Q=23.5 Å−1 for 50 < T < 1023 K and produced via Fourier transform a pair-distribution function PDF(r). The PDF(r) shows quite clearly that r(U–O), defined by the maximum of the U–O peak in the PDF(r), does in fact decrease with increasing temperature, whereas r(U–U) follows the lattice expansion, as expected. We also observe that the r(U–O) contraction accelerates continuously above T ≈ 400 K, consistent with earlier experiments by others. Furthermore, by analysing the eigenvectors of the phonon modes, we show that the Δ5(TO1) phonon tends to separate the eight equivalent U–O distances into six shorter and two longer distances, where the longer pair contribute to a high-r tail observed in the U–O distance distribution becoming increasingly anisotropic at higher T. These results have significance for a wide range of materials in which heavy and light atoms are combined in a simple atomic structure [1].[1] L. Desgranges et al. J. Physics: Condensed Matter 35 10LT01 (2023)
Published: 2023

30. Fractional matter coupled to the emergent gauge field in a quantum spin ice

Author: Porée, Victor, Yan, Han, Desrochers, Félix, Petit, Sylvain, Lhotel, Elsa, Appel, Markus, Ollivier, Jacques, Kim, Yong Baek, Nevidomskyy, Andriy H., Sibille, Romain, Paul Scherrer Institute (PSI), Rice University [Houston], University of Toronto, Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Magnétisme et Supraconductivité (NEEL - MagSup), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and Institut Laue-Langevin (ILL)
Subjects: Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract: Electronic spins can form long-range entangled phases of condensed matter named quantum spin liquids. Their existence is conceptualized in models of two- or three-dimensional frustrated magnets that evade symmetry-breaking order down to zero temperature. Quantum spin ice (QSI) is a theoretically well-established example described by an emergent quantum electrodynamics, with excitations behaving like photon and matter quasiparticles. The latter are fractionally charged and equivalent to the `spinons' emerging from coherent phases of singlets in one dimension, where clear experimental proofs of fractionalization exist. However, in frustrated magnets it remains difficult to establish consensual evidence for quantum spin liquid ground states and their fractional excitations. Here, we use backscattering neutron spectroscopy to achieve extremely high resolution of the time-dependent magnetic response of the candidate QSI material Ce$_2$Sn$_2$O$_7$. We find a gapped spectrum featuring a threshold and peaks that match theories for pair production and propagation of fractional matter excitations (spinons) strongly coupled to a background gauge field. The observed peaks provide evidence for a QSI through spectroscopic signatures of space-time symmetry fractionalization, while the threshold behavior corroborates the regime of strong light-matter interaction predicted for the emergent universe in a QSI., 18 pages, 5 figures, updated references
Published: 2023

31. Hermitian and non-Hermitian Weyl physics in synthetic three-dimensional piezoelectric phononic beams

Author: Liangshu He, Yan Li, Bahram Djafari-Rouhani, Yabin Jin, Tongji University, School of Aerospace Engineering and Applied Mechanics, Northwest University (Xi'an), Physique - IEMN (PHYSIQUE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), ACKNOWLEDGMENTSThis paper is supported by the National Natural Science Foundation of China (Grant No. 12272267), theYoung Elite Scientists Sponsorship Program by CAST(Grant No. 2021QNRC001), and the Shanghai Science andTechnology Committee (Grants No. 22JC1404100 and No.21JC1405600), the program for the professor of specialappointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, the Fundamental Research Funds for the Central Universities., Physique - IEMN [PHYSIQUE - IEMN], and Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Subjects: General Physics and Astronomy, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Abstract: International audience; Recently, the evolution of the Weyl point (WP) caused by the introduction of nonhermiticity into Weyl semimetals has aroused great research interest. We consider elastic flexural wave propagation in a phononic beam containing piezoelectric materials and introduce nonhermiticity through active regulation of external circuits. Considering a synthetic parameter space constituted by the one-dimensional Bloch wave vector and two geometrical parameters, we demonstrate that a double WP (DWP) arises at the band crossing. Then we study its evolution from the hermitic to nonhermitic situation under the effect of the active piezoelectric materials. We find that the DWP in the hermitic case evolves into a Weyl degenerate line and a Weyl hollow ring as concerns the real and imaginary parts of the Weyl frequencies, respectively. The formation mechanisms of the DWPs, lines, and rings are explained through the Hamiltonian of the system. Further, we observe the changes of the DWP and degenerate line in the transmission spectra of finite structures. Finally, we discuss the synthetic Fermi arc interface states through the analysis of the reflected phase vortices. In this paper, we provide insights into the high-dimensional Hermitian and non-Hermitian physics in elastic wave systems using synthetic dimensions.
Published: 2023

32. Bath-induced phase transition in a Luttinger liquid

Author: Saptarshi Majumdar, Laura Foini, Thierry Giamarchi, Alberto Rosso, Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and ANR-10-LABX-0039,PALM,Physics: Atoms, Light, Matter(2010)
Subjects: FOS: Physical sciences, Disordered Systems and Neural Networks (cond-mat.dis-nn), [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter - Disordered Systems and Neural Networks
Abstract: We study an XXZ spin chain, where each spin is coupled to an independent ohmic bath of harmonic oscillators at zero temperature. Using bosonization and numerical techniques, we show the existence of two phases separated by an Kosterlitz-Thouless (KT) transition. At low coupling with the bath, the chain remains in a Luttinger liquid phase with a reduced but finite spin stiffness, while above a critical coupling the system is in a dissipative phase characterized by a vanishing spin stiffness. We argue that the transport properties are also inhibited: the Luttinger liquid is a perfect conductor while the dissipative phase displays finite resistivity. Our results show that the effect of the bath can be interpreted as annealed disorder inducing signatures of localization., 11 pages, 4 figures
Published: 2023

33. Experimental evidence of zonal dislocations in the Ti2AlC MAX phase

Author: Mussi, Alexandre, Henzelmeier, Adrien, Weidner, Timmo, Novelli, Marc, Wenbo, Yu, Cuvilly, Fabien, Grosdidier, Thierry, Guitton, Antoine, Unité Matériaux et Transformations - UMR 8207 (UMET), Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Labex DAMAS, Université de Lorraine (UL), Beijing Jiaotong University (BJTU), Groupe de physique des matériaux (GPM), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Surface mechanical attrition treatment, Mechanics of Materials, Severe plastic deformation, Mechanical Engineering, Dislocations, General Materials Science, MAX phases, [SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter Physics, Transmission electron microscopy, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: International audience; The dislocation configurations of a Ti2AlC-MAX phase deformed under severe plastic deformation by surface mechanical attrition treatment have been analyzed by transmission electron microscopy. Results show that the microstructure of the deformed Ti2AlC sample is composed of numerous 〈a〉-dislocations, which interact with each other notably with dipolar configurations. In addition, we report here 〈a〉-dislocation dissociations in the basal plane with a dissociation distance of approximately 20 nm, following the reaction 1/3 〈21 ̅1 ̅0〉⇔1/3 〈11 ̅00〉+1/3 〈101 ̅0〉. Finally, strong evidence of zonal dislocations is reported. These original results are discussed in the context of the fundamental deformation mechanisms of nanolayered ternary alloys.
Published: 2023

34. M -plane AlGaN digital alloy for microwire UV-B LEDs

Author: Lucie Valera, Vincent Grenier, Sylvain Finot, Catherine Bougerol, Joël Eymery, Gwénolé Jacopin, Christophe Durand, Nanophysique et Semiconducteurs (NPSC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Semi-conducteurs à large bande interdite (NEEL - SC2G), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Nanophysique et Semiconducteurs (NEEL - NPSC), Modélisation et Exploration des Matériaux (MEM), Nanostructures et Rayons X (NRX), ANR-15-IDEX-0002,UGA,IDEX UGA(2015), and ANR-22-CE51-0032,HARAlN,Fabrication de nanosources émettant efficacement dans l'UV profond à partir de nanofils AlN à fort facteur de forme(2022)
Subjects: Physics and Astronomy (miscellaneous), [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: International audience; The growth of non-polar AlGaN digital alloy (DA) is achieved by metal-organic vapor phase epitaxy using GaN microwire m-facets as the template. This AlGaN DA consisting of five periods of two monolayer-thick layers of GaN and AlGaN (approximately 50% Al-content) is integrated into the middle of an n-p GaN/AlGaN junction to design core-shell wire- μLED. The optical emission of the active zone investigated by 5 K cathodoluminescence is consistent with the AlGaN bulk alloy behavior. Several contributions from 295 to 310 nm are attributed to the lesser thickness and/or composition fluctuations of AlGaN DA. Single-wire μLED is fabricated using a lithography process, and I–V measurements confirm a diode rectifying behavior. Room temperature UV electroluminescence originating from m-plane AlGaN DA is accomplished at 310 nm.
Published: 2023

35. Study of Mn ion charge state in Zn2TiO4 and its impact on the photoluminescence and optical absorption spectra

Author: L. Borkovska, T. Stara, O. Gudymenko, K. Kozoriz, I. Vorona, V. Nosenko, C. Labbe, J. Cardin, T. Kryshtab, V.E. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine (NASU), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Nanomatériaux, Ions et Métamatériaux pour la Photonique (NIMPH), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Escuela Superior de Fisica y Matematicas [Mexico] (ESFM), and Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV)
Subjects: [PHYS]Physics [physics], Electrical and Electronic Engineering, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: International audience
Published: 2023

36. Lasing in a ZnO waveguide: Clear evidence of polaritonic gain obtained by monitoring the continuous exciton screening

Author: Geoffrey Kreyder, Léa Hermet, Pierre Disseix, François Médard, Martine Mihailovic, François Réveret, Sophie Bouchoule, Christiane Deparis, Jesús Zuñiga-Pérez, Joël Leymarie, Institut Pascal (IP), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), Université Clermont Auvergne (UCA)-Université Clermont Auvergne (UCA), Centre de Nanosciences et de Nanotechnologies (C2N), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), MajuLab, and National University of Singapore (NUS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)
Subjects: Condensed Matter - Materials Science, PhotoluminescenceTime-resolved, Wide band gap systems, Polaritons, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, photoluminescence, II-VI semiconductors, Excitons, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Waveguides
Abstract: International audience; The coherent emission of exciton polaritons was proposed as a means of lowering the lasing threshold because it does not require the dissociation of excitons to obtain an electron-hole plasma, as in a classical semiconductor laser based on population inversion. In this work we propose a method to prove clearly the polaritonic nature of lasing by combining experimental measurements with a model accounting for the permittivity change as a function of the carrier density. To do so we use angle resolved photoluminescence to observe the lasing at cryogenic temperature from a polariton mode in a zinc oxide waveguide structure, and to monitor the continuous shift of the polaritonic dispersion towards a photonic dispersion as the optical intensity of the pump is increased (up to 20 times the one at threshold). This shift is reproduced thanks to a model taking into account the reduction of the oscillator strength and the renormalization of the band gap due to the screening of the electrostatic interaction between electrons and holes. Furthermore, the measurement of the carrier lifetime at optical intensities in the order of those at which the polariton lasing occurs enables us to estimate the carrier density, confirming that it is lower than the corresponding Mott density for zinc oxide reported in the literature.
Published: 2023

37. Interfacial properties of protein particles at fluid/fluid interfaces and relationship with the stability of foams and emulsions

Author: Faumeau, Anne Laure, Guzmán, Eduardo, Ritacco, Hernán A., Saint Jalmes, Arnaud, Unité Matériaux et Transformations - UMR 8207 (UMET), Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Instituto de Física del Sur y Departamento de Física, Universidad Nacional del Sur [Argentina] (UNS)-Universidad Nacional del Sur [Argentina] (UNS), Institut de Physique de Rennes (IPR), and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS]Physics [physics], [CHIM]Chemical Sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: International audience; It is now well-known that the assembly of particles at fluid/fluid interfaces, and the resulting dynamical properties of such particle-laden interfaces can provide high stabilization of dispersed systems such as emulsions and foams. Here, we focus on the emerging case of “protein particles,” a novel family of bio particles. We provide an updated perspective about their definition, production, bulk and interface properties, highlighting the most recent results of the obtained bioparticle-laden interfaces, and how such protein particles can stabilize liquid dispersions. The ability of protein particles for undergoing a fast adsorption to fluid/fluid interfaces and for forming viscoelastic layers play a key role on the prevention of drainage, coalescence, or coarsening/ripening, which results in the formation of very stable particle-stabilized foams and emulsions. Therefore, protein particles are an excellent bio-based alternative to synthetic surfactants and other conventional stabilizers for ensuring the stabilization of a broad range of dispersed systems, opening new avenues for the design of new products with interest for cosmetic, food and biomedical industries.
Published: 2023

38. UV emission from MOVPE nanowire LEDs

Author: Durand, Christophe, Grenier, Vincent, Finot, Sylvain, Valera, Lucie, Bougerol, C., Eymery, Joël, Jacopin, Gwenolé, Nanophysique et Semiconducteurs (NPSC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Semi-conducteurs à large bande interdite (NEEL - SC2G), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Nanophysique et Semiconducteurs (NEEL - NPSC), Modélisation et Exploration des Matériaux (MEM), Nanostructures et Rayons X (NRX), and SPIE
Subjects: [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: International audience; The use of nanowires has recently emerged to go further in the development of nitride UV LEDs, especially to improve the efficiency or to make micro-sized UV-sources and flexible LEDs/photodetectors. Our current research interest is focused on the core-shell UV quantum wells grown by industrial MOVPE epitaxy tool. Several types of core-shell quantum wells have been successfully achieved: GaN/InAlN for UV-A, GaN/AlGaN or AlGaN/AlGaN for UV-A and UV-B. When the UV GaN/AlGaN QWs are embedded in a core-shell AlGaN p-n junction, the electroluminescence is demonstrated on single-wire μLEDs in the UV-A and UV-B. The further development of core-shell GaN/AlGaN monolayered system is also shown with demonstration of UV-B emission for single-wire μLEDs.
Published: 2023

39. Variational Benchmarks for Quantum Many-Body Problems

Author: Wu, Dian, Rossi, Riccardo, Vicentini, Filippo, Astrakhantsev, Nikita, Becca, Federico, Cao, Xiaodong, Carrasquilla, Juan, Ferrari, Francesco, Georges, Antoine, Hibat-Allah, Mohamed, Imada, Masatoshi, Läuchli, Andreas M., Mazzola, Guglielmo, Mezzacapo, Antonio, Millis, Andrew, Moreno, Javier Robledo, Neupert, Titus, Nomura, Yusuke, Nys, Jannes, Parcollet, Olivier, Pohle, Rico, Romero, Imelda, Schmid, Michael, Silvester, J. Maxwell, Sorella, Sandro, Tocchio, Luca F., Wang, Lei, White, Steven R., Wietek, Alexander, Yang, Qi, Yang, Yiqi, Zhang, Shiwei, Carleo, Giuseppe, Laboratoire de Physique Théorique de la Matière Condensée (LPTMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique [Palaiseau] (CPHT), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Collège de France - Chaire Physique de la matière condensée (A. Georges), Collège de France (CdF (institution)), Institut de Physique Théorique - UMR CNRS 3681 (IPHT), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: Quantum Physics, Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], FOS: Physical sciences, [INFO]Computer Science [cs], Computational Physics (physics.comp-ph), [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Quantum Physics (quant-ph), Physics - Computational Physics
Abstract: The continued development of novel many-body approaches to ground-state problems in physics and chemistry calls for a consistent way to assess its overall progress. Here we introduce a metric of variational accuracy, the V-score, obtained from the variational energy and its variance. We provide the most extensive curated dataset of variational calculations of many-body quantum systems to date, identifying cases where state-of-the-art numerical approaches show limited accuracy, and novel algorithms or computational platforms, such as quantum computing, could provide improved accuracy. The V-score can be used as a metric to assess the progress of quantum variational methods towards quantum advantage for ground-state problems, especially in regimes where classical verifiability is impossible., 25 pages, 5 figures
Published: 2023

40. Electrical manipulation of a single electron spin in CMOS with micromagnet and spin-valley coupling

Author: Klemt, Bernhard, El-Homsy, Victor, Nurizzo, Martin, Hamonic, Pierre, Martinez, Biel, Paz, Bruna Cardoso, Spence, Cameron, Dartiailh, Matthieu, Jadot, Baptiste, Chanrion, Emmanuel, Thiney, Vivien, Lethiecq, Renan, Bertrand, Benoit, Niebojewski, Heimanu, Bäuerle, Christopher, Vinet, Maud, Niquet, Yann-Michel, Meunier, Tristan, Urdampilleta, Matias, Circuits électroniques quantiques Alpes (NEEL - QuantECA), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), and Direction de Recherche Technologique (CEA) (DRT (CEA))
Subjects: noise, Condensed Matter - Mesoscale and Nanoscale Physics, spin: orbit, FOS: Physical sciences, fabrication, semiconductor, electric field, electron: spin, decoupling, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Mesoscale and Nanoscale Physics (cond-mat.mes-hall), semiconductor detector, superconducting circuit, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], qubit
Abstract: For semiconductor spin qubits, complementary-metal-oxide-semiconductor (CMOS) technology is the ideal candidate for reliable and scalable fabrication. Making the direct leap from academic fabrication to qubits fabricated fully by industrial CMOS standards is difficult without intermediate solutions. With a flexible back-end-of-line (BEOL) new functionalities such as micromagnets or superconducting circuits can be added in a post-CMOS process to study the physics of these devices or achieve proof of concepts. Once the process is established it can be incorporated in the foundry-compatible process flow. Here, we study a single electron spin qubit in a CMOS device with a micromagnet integrated in the flexible BEOL. We exploit the synthetic spin orbit coupling (SOC) to control the qubit via electric field and we investigate the spin-valley physics in the presence of SOC where we show an enhancement of the Rabi frequency at the spin-valley hotspot. Finally, we probe the high frequency noise in the system using dynamical decoupling pulse sequences and demonstrate that charge noise dominates the qubit decoherence in this range., 11 pages, 10 figures
Published: 2023

41. Unitary interaction geometries in few-body systems

Author: Contessi, Lorenzo, Kirscher, Johannes, Pavon Valderrama, Manuel, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Nuclear Theory (nucl-th), Quantum Physics, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Nuclear Theory, Quantum Gases (cond-mat.quant-gas), FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Quantum Physics (quant-ph), Condensed Matter - Quantum Gases
Abstract: We consider few-body systems in which only a certain subset of the particle-particle interactions is resonant. We characterize each subset by a {\it unitary graph} in which the vertices represent distinguishable particles and the edges resonant 2-body interactions. Few-body systems whose unitary graph is connected will collapse unless a repulsive 3-body interaction is included. We find two categories of graphs, distinguished by the kind of 3-body repulsion necessary to stabilize the associated system. Each category is characterized by whether the graph contains a loop or not: for tree-like graphs (graphs containing a loop) the 3-body force renormalizing them is the same as in the 3-body system with two (three) resonant interactions. We show numerically that this conjecture is correct for the 4-body case as well as for a few 5-body configurations. We explain this result in the 4-body sector qualitatively by imposing Bethe-Peierls boundary conditions on the pertinent Faddeev-Yakubovsky~decomposition of the wave function., 17 pages, 8 figures
Published: 2023

42. Rotor/spin-wave theory for quantum spin models with U(1) symmetry

Author: Roscilde, Tommaso, Comparin, Tommaso, Mezzacapo, Fabio, Laboratoire de Physique de l'ENS Lyon (Phys-ENS), and École normale supérieure de Lyon (ENS de Lyon)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Condensed Matter - Strongly Correlated Electrons, Quantum Physics, Strongly Correlated Electrons (cond-mat.str-el), [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], FOS: Physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Quantum Physics (quant-ph)
Abstract: The static and dynamics properties of finite-size lattice quantum spin models which spontaneously break a continuous $U(1)$ symmetry in the thermodynamic limit are of central importance for a wide variety of physical systems, from condensed matter to quantum simulation. Such systems are characterized by a Goldstone excitation branch, terminating in a zero mode whose theoretical treatment within a linearized approach leads to divergencies on finite-size systems, revealing that the assumption of symmetry breaking is ill-defined away from the thermodynamic limit. In this work we show that, once all its non-linearities are taken into account, the zero mode corresponds exactly to a U(1) quantum rotor, related to the Anderson tower of states expected in systems showing symmetry breaking in the thermodynamic limit. The finite-momentum modes, when weakly populated, can be instead safely linearized (namely treated within spin-wave theory) and effectively decoupled from the zero mode. This picture leads to an approximate separation of variables between rotor and spin-wave ones, which allows for a correct description of the ground-state and low-energy physics. Most importantly, it offers a quantitative treatment of the finite-size non-equilibrium dynamics -- following a quantum quench -- dominated by the zero mode, for which a linearized approach fails. Focusing on the 2$d$ XX model with power-law decaying interactions, we compare our equilibrium predictions with unbiased quantum Monte Carlo results and exact diagonalization; and our non-equilibrium results with time-dependent variational Monte Carlo. The agreement is remarkable for all interaction ranges, and it improves the longer the range. Our rotor/spin-wave theory defines a successful strategy for the application of spin-wave theory and its extensions to finite-size systems at equilibrium or away from it., 18 pages, 5 figures; v2: a few mistakes fixed in Sec. VI and App. B
Published: 2023

43. Piezoelectric, magnetic and magnetoelectric properties of a new lead-free multiferroic (1-x) Ba0.95Ca0.05Ti0.89Sn0.11O3—(x) CoFe2O4 particulate composites

Author: Youness Hadouch, Daoud Mezzane, M.’barek Amjoud, Nouredine Oueldna, Yaovi Gagou, Zdravko Kutnjak, Valentin Laguta, Yakov Kopelevich, Khalid Hoummada, Mimoun El Marssi, Université Cadi Ayyad [Marrakech] (UCA), Laboratoire de Physique de la Matière Condensée - UR UPJV 2081 (LPMC), Université de Picardie Jules Verne (UPJV), Laboratoire des Matériaux Innovants, Energie et Développement Durable [Marrakech] (IMED-Lab ), Faculté des Sciences et Techniques Marrakech (FSTG), Université Cadi Ayyad [Marrakech] (UCA)-Université Cadi Ayyad [Marrakech] (UCA), Laboratory of Condensed Matter and Nanostructures, Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Jozef Stefan Institute [Ljubljana] (IJS), Institute for Problems of Material Science, National Academy of Sciences of Ukraine (NASU), Institute of Physics ASCR, Institute of Physics of the Czech Academy of Sciences (FZU / CAS), Czech Academy of Sciences [Prague] (CAS)-Czech Academy of Sciences [Prague] (CAS), and Universidade Estadual de Campinas = University of Campinas (UNICAMP)
Subjects: Electrical and Electronic Engineering, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Abstract: International audience; New multiferroic particulate composites (1-x) Ba0.95Ca0.05Ti0.89Sn0.11O3-(x) CoFe2O4 with (x = 0.1, 0.2, 0.3, 0.4 and 0.5) have been prepared by mechanical mixing of the calcined and milled individual ferroic phases. X-ray diffraction and Raman spectroscopy analysis confirmed the formation of both perovskite Ba0.95Ca0.05Ti0.89Sn0.11O3 (BCTSn) and spinel CoFe2O4 (CFO) phases without the presence of additional phases. The morphological properties of the composites were provided by using field emission scanning electron microscopy. The BCTSn-CFO composites exhibit multiferroic behavior at room temperature, as evidenced by ferroelectric and ferromagnetic hysteresis loops. For all composites, the converse piezoelectric coefficient was calculated and found to decrease from 203 pm.V-1 to 27 pm.V-1 in pure BCTSn. when the CFO content increases. The magnetoelectric (ME) coupling was measured under a magnetic field up to 10 kOe and the maximum ME response found to be 0.1 mV.cm(-1).Oe(-1) for the composition 0.7 BCTSn-0.3 CFO exhibiting a high degree of pseudo-cubicity and large density.
Published: 2023

44. Infrared Spectroscopic Study on Swift-Ion Irradiation of Solid N2O–H2O Samples: Synthesis of N–O Bearing Species in Astrophysical Ices

Author: Alexandre Bergantini, Ana Lucia Ferreira de Barros, Naomi Nitahara Toribio, Hermann Rothard, Philippe Boduch, Enio Frota da Silveira, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (Rio de Janeiro) ( CEFET/RJ), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Atomes, Molécules et Agrégats (AMA), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio)
Subjects: [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Physical and Theoretical Chemistry
Abstract: International audience; As of early 2022, only six species bearing an N−Obond have been detected toward cold molecular clouds and regionsof star formation. It is not clear yet if the small number of N−Obond species found in the interstellar medium so far stems fromphysical and technological limitations of astronomical detectiontechniques, or whether in fact molecules that bear an N−O bondare for some reason rare in these objects of the interstellar medium.Astronomical N−O bearing molecules are important because theyare part of astrochemical models which propose that they areprecursors of hydroxylamine (NH2OH), a species linked to theformation of prebiotic amino acids in space. The aim of this studyis the better understanding of the open question of the interstellarsynthesis of N−O bearing species. We have analyzed by infraredspectroscopy an astrophysically relevant polar ice mixture of N2O:H2O processed by 90 MeV 136Xe23+ ions, which can mimic thephysicochemical processes triggered by cosmic rays in water-covered interstellar ice grains. The results show the formation of N2O3and of H2O2, but no HN−O species of any kind were detected. Such findings are discussed in light of recent studies from our groupand from the literature.
Published: 2022

45. The search for manganese incorporation in MoSe 2 monolayer epitaxially grown on graphene

Author: Maxime Gay, Minh-Tuan Dau, Céline Vergnaud, Alain Marty, Frédéric Bonell, Hervé Boukari, Colin Paillet, Bérangère Hyot, Hanako Okuno, Pierre Mallet, Jean-Yves Veuillen, Olivier Renault, Matthieu Jamet, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Nanophysique et Semiconducteurs (NPSC), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Nano-Electronique Quantique et Spectroscopie (QuNES), ANR-18-CE24-0007,MAGICVALLEY,Polarisation de vallée induite par couplage d'échange magnétique dans les matériaux 2D à grande échelle(2018), ANR-10-LABX-0051,LANEF,Laboratory of Alliances on Nanosciences - Energy for the Future(2010), Nanophysique et Semiconducteurs (NEEL - NPSC), and Nano-Electronique Quantique et Spectroscopie (NEEL - QuNES)
Subjects: Materials science, Graphene, General Physics and Astronomy, chemistry.chemical_element, 02 engineering and technology, Manganese, 2D materials, 021001 nanoscience & nanotechnology, Epitaxy, 01 natural sciences, law.invention, Crystallography, chemistry, law, 0103 physical sciences, Monolayer, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Magnetic doping, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Scanning tunneling microscopy, 010306 general physics, 0210 nano-technology, Molecular beam epitaxy, Transmission electron microscopy, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2022

46. Measuring graphene’s Berry phase at B=0 T

Author: Ivan Brihuega, Mikhail I. Katsnelson, Vincent T. Renard, Héctor González-Herrero, C. Dutreix, Claude Chapelier, Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), Departamento de Fisica de la Materia Condensada [Madrid] (FMC), Facultad de Ciencas [Madrid], Universidad Autonoma de Madrid (UAM)-Universidad Autonoma de Madrid (UAM), Condensed Matter Physics Center (IFIMAC), Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Institute for Molecules and Materials [Nijmegen], Radboud university [Nijmegen], Laboratoire de Transport Electronique Quantique et Supraconductivité (LaTEQS), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Universidad Autónoma de Madrid (UAM)-Universidad Autónoma de Madrid (UAM), and Radboud University [Nijmegen]
Subjects: [PHYS]Physics [physics], Materials science, Condensed matter physics, Graphene, Theory of Condensed Matter, General Physics and Astronomy, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, law.invention, Geometric phase, law, 0103 physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, 0210 nano-technology
Abstract: International audience; The Berry phase of wave functions is a key quantity to understand various low-energy propertiesof matter, among which electric polarisation, orbital magnetism, as well as topological and ultra-relativisticphenomena. Standard approaches to probe the Berry phase in solids rely on the electron dynamics inresponse to electromagnetic forces. In graphene, probing the Berry phase π of the massless relativisticelectrons requires an external magnetic field. Here, we show that the Berry phase also affects the staticresponse of the electrons to a single atomic scatterer, through wavefront dislocations in the surroundingstanding-wave interference. This provides a new experimental method to measure the graphene Berry phasein the absence of any magnetic field and demonstrates that local disorder can be exploited as probe oftopological quantum matter in scanning tunnelling microscopy experiments.; Les interférences de quasiparticules observées par microscopie à effet tunnel sont particulièrementutiles pour étudier les propriétés électroniques de matériaux en surfaces. Ces interférences possèdent desinformations sur la surface de Fermi du système et leur résolution en énergie permet, dans certains cas,de reconstruire la relation dispersion. Nous montrons ici que les images d’interférences de quasiparticulespeuvent aussi contenir une information sur la phase de Berry qui caractérise la structure de bande dumatériau. La phase de Berry est une phase géométrique que les fonctions d’onde electroniques acquièrentlors d’une évolution cyclique dans un espace de paramètres. Elle est quantifiée lorsque la trajectoire del’évolution enserre une singularité des fonctions d’onde. Il s’agit alors d’une propriété topologique de lastructure de bande. La phase de Berry dans les solides est traditionnellement mesurée en appliquant deschamps électromagnétiques pour forcer les particules à former de trajectoires fermées. L’utilisation de lafigure d’interférence de quasiparticules permet de s’extraire de ce paradigme car la phase de Berry peutaffecter la réponse statique des électrons au désordre en l’absence de champ électromagnétique.
Published: 2022

47. A comprehensive atomistic picture of the as-deposited Ni-Si interface before thermal silicidation process

Author: Jara Donoso, César, Jay, Antoine, Lam, Julien, Müller, Jonas, Larrieu, Guilhem, Landa, Georges, Bongiorno, Corrado, La Magna, Antonino, Alberti, Alessandra, Hémeryck, Anne, Équipe Modélisation Multi-niveaux des Matériaux (LAAS-M3), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Équipe Matériaux et Procédés pour la Nanoélectronique (LAAS-MPN), and IMM-CNR
Subjects: General Physics and Astronomy, Surfaces and Interfaces, General Chemistry, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter Physics, Surfaces, Coatings and Films
Abstract: International audience; Despite numerous technological applications associated to nickel silicide thin films, their formation mechanisms are still far from being understood. We combined experimental and numerical approaches to unravel the early stages of nickel silicide formation with an atomistic precision. In particular, we employed first principles calculations, X-ray reflectivity as well as high-resolution scanning transmission electron microscopy analyses. Altogether, our work demonstrates that during nickel deposition on top of a silicon surface, an interface alloyed layer is formed even at room temperature before any thermal activation. Moreover, we managed to determine that this interfacial layer has a nickel-rich Ni3Si composition which is favored by the ability of nickel atoms to penetrate the surface layers of the silicon substrate.
Published: 2023

48. Guided-Mode Resonator Coupled with Nanocrystal Intraband Absorption

Author: Khalili, Adrien, Weis, Mateusz, Mizrahi, Simon Gwénaël, Chu, Audrey, Dang, Tung Huu, Abadie, Claire, Gréboval, Charlie, Dabard, Corentin, Prado, Yoann, Xu, Xiang Zhen, Péronne, Emmanuel, Livache, Clément, Ithurria, Sandrine, Patriarche, Gilles, Ramade, Julien, Vincent, Grégory, Boschetto, Davide, Lhuillier, Emmanuel, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), DOTA, ONERA, Université Paris Saclay [Palaiseau], ONERA-Université Paris-Saclay, Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Nanostructures et optique (INSP-E4), Los Alamos National Laboratory (LANL), Centre de Nanosciences et de Nanotechnologies (C2N), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Physique et Propriétés des Nanostructures PPNa (PPNa), Département Physique et Mécanique des Matériaux (Département Physique et Mécanique des Matériaux), Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019), ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-21-CE24-0012,BRIGHT,Diode électroluminescente infrarouge brillante par exaltation du couplage lumière-matière(2021), ANR-21-CE09-0029,MixDFerro,Heterostructures à dimensions mixtes sous contrôle ferroélectrique 2D(2021), ANR-20-ASTR-0008,NITquantum,Design et fabrication d'un plan focal dans le proche infrarouge à base de nanocrisrtaux(2020), European Project: 756225,blackQD, and European Project: 853049,ne2dem
Subjects: intraband absorption, optical resonator, mid-infrared, mercury chalcogenides, [CHIM.MATE]Chemical Sciences/Material chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Electrical and Electronic Engineering, doped nanocrystals, Atomic and Molecular Physics, and Optics, Biotechnology, Electronic, Optical and Magnetic Materials
Abstract: International audience; Intraband absorption in doped nanocrystals offers an interesting alternative to narrow band gap materials to explore mid infrared optoelectronic device designs. However, the performance of such device clearly lags behind the ones relying on intrinsic materials. Livache et al. have proposed a dye sensitized approach to overcome the limitations observed from intraband materials (high dark current, slow response, low activation energy), where the intraband absorber is coupled to an undoped material which takes care of the charge conduction. Here, we unveil the coupling between both materials using mid-infrared transient reflectivity (TR) measurement. We show that hybrid material displays a unique feature in the TR signal that we attribute to a charge transfer and for which the dynamic matches the hopping time. We then developed a strategy to enhance the photodetection performances of the hybrid material by coupling for the first time intraband absorption to a light resonator. The latter is used to enhance the absorption by a factor 4 and enables an increase of the operating temperature by 80 K compared to the reference device. The obtained device matches the performance of best devices relying on intraband absorption.
Published: 2022

49. Ferromagnetism and Rashba Spin–Orbit Coupling in the Two-Dimensional (V,Pt)Se2 Alloy

Author: Emilio Vélez-Fort, Ali Hallal, Roberto Sant, Thomas Guillet, Khasan Abdukayumov, Alain Marty, Céline Vergnaud, Jean-François Jacquot, Denis Jalabert, Jun Fujii, Ivana Vobornik, Julien Rault, Nicholas B. Brookes, Danilo Longo, Philippe Ohresser, Abdelkarim Ouerghi, Jean-Yves Veuillen, Pierre Mallet, Hervé Boukari, Hanako Okuno, Mairbek Chshiev, Frédéric Bonell, Matthieu Jamet, SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), European Synchrotron Radiation Facility (ESRF), Conception d’Architectures Moléculaires et Processus Electroniques (CAMPE ), SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé (SYMMES), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Département Interfaces pour l'énergie, la Santé et l'Environnement (DIESE), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Laboratorio TASC (IOM CNR), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), CNR Istituto Officina dei Materiali (IOM), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies (C2N), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Nano-Electronique Quantique et Spectroscopie (NEEL - QuNES), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Nanophysique et Semiconducteurs (NEEL - NPSC), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), ANR-18-CE24-0007,MAGICVALLEY,Polarisation de vallée induite par couplage d'échange magnétique dans les matériaux 2D à grande échelle(2018), ANR-10-LABX-0051,LANEF,Laboratory of Alliances on Nanosciences - Energy for the Future(2010), and European Project: 785219,H2020,GrapheneCore2(2018)
Subjects: Condensed Matter::Materials Science, Materials Chemistry, Electrochemistry, Condensed Matter::Strongly Correlated Electrons, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Electronic, Optical and Magnetic Materials
Abstract: 5 pages, 5 figures; International audience; We report on a two-dimensional (2D) V1–xPtxSe2 alloy that exhibits ferromagnetic order and Rashba spin–orbit coupling. Although ferromagnetism is absent in 1T-VSe2 because of the competition with the charge density wave phase, we demonstrate theoretically and experimentally that the substitution of vanadium by platinum in VSe2 (10–50%) to form a homogeneous 2D alloy restores ferromagnetic order down to one monolayer of V0.65Pt0.35Se2. Moreover, the presence of platinum atoms gives rise to Rashba spin–orbit coupling in (V,Pt)Se2, providing an original platform to study the interplay between ferromagnetism and spin–orbit coupling in the 2D limit.
Published: 2022

50. Optical excitation processes: general discussion

Author: Martin Appleby, Kyle Barlow, Martina Basini, Lara Benfatto, Yorrick Boeije, Andrew Burnett, Lin X. Chen, Eric Collet, Hermann A. Dürr, Graham Fleming, Aswathy V. Girija, Mohammed Th. Hassan, Hamoon Hedayat, Shinichiro Iwai, J. Olof Johansson, Steven L. Johnson, Kota Katsumi, Pyosang Kim, James K. McCusker, Ryan Phelps, Jan Michael Rost, Erica Sutcliffe, Julian Wagner, Julia Weinstein, Serhane Zerdane, Univ Roma La Sapienza, Dept Phys, CNR ISC, I-00185 Rome, Italy, Chemical Sciences and Engineering Division [Argonne], Argonne National Laboratory [Lemont] (ANL), Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa, Institute of Cardiovascular Regeneration [Frankfurt, Germany] (Centre for Molecular Medicine), Goethe-University Frankfurt am Main, German Center for Cardiovascular Research (DZHK), and Berlin Institute of Health (BIH)
Subjects: [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Physical and Theoretical Chemistry
Abstract: International audience
Published: 2022

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