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1. Partition Function of the Levin-Wen Model

Author

Julien Vidal, Laboratoire de Physique Théorique de la Matière Condensée (LPTMC), and Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
High Energy Physics - Theory, Quantum Physics, Strongly Correlated Electrons (cond-mat.str-el), partition function, FOS: Physical sciences, finite temperature, critical phenomena, 01 natural sciences, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], 010305 fluids & plasmas, thermal, Condensed Matter - Strongly Correlated Electrons, Wilson loop, High Energy Physics - Theory (hep-th), finite size, 0103 physical sciences, excited state, surface, anyon, energy levels, Quantum Physics (quant-ph), 010306 general physics
Abstract

Using a description of the Levin-Wen model excitations in terms of Wilson lines, we compute the degeneracy of the energy levels for any input anyon theory and for any trivalent graph embedded on any (orientable) compact surface. This result allows one to obtain the finite-size and finite-temperature partition function and to show that there are no thermal phase transitions., Comment: 7 pages, 2 figures, published version

Published
2021

2. Solute-point defect interactions, coupled diffusion, and radiation-induced segregation in fcc nickel

Author

Elin Toijer, Julien Vidal, Luca Messina, Charlotte Becquart, Pär Olsson, Christophe Domain, Royal Institute of Technology [Stockholm] (KTH ), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Matériaux et Mécanique des Composants (EDF R&D MMC), EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF), Etude et Modélisation des Mécanismes de Vieillissement des Matériaux (EM2VM), Centrale Lille-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)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-EDF R&D (EDF R&D), 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), Centrale Lille Institut (CLIL)-EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF)-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)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), 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)-Centrale Lille Institut (CLIL), Université de Lille, CNRS, INRA, ENSCL, Royal Institute of Technology [Stockholm] [KTH ], Matériaux et Mécanique des Composants [EDF R&D MMC], and Unité Matériaux et Transformations - UMR 8207 [UMET]

Subjects
Materials science, Physics and Astronomy (miscellaneous), Diffusion, FOS: Physical sciences, chemistry.chemical_element, Thermodynamics, Context (language use), Applied Physics (physics.app-ph), 02 engineering and technology, Cubic crystal system, 01 natural sciences, defects, diffusion, irradiation effects, Ab initio quantum chemistry methods, 0103 physical sciences, General Materials Science, 010306 general physics, Embrittlement, Austenite, Condensed Matter - Materials Science, Materials Science (cond-mat.mtrl-sci), Physics - Applied Physics, [CHIM.MATE]Chemical Sciences/Material chemistry, Atmospheric temperature range, 021001 nanoscience & nanotechnology, Nickel, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract

International audience; Radiation-induced segregation (RIS) of solutes in materials exposed to irradiation is a well-known problem.It affects the lifetime of nuclear reactor core components by favoring radiation-induced degradation phenomena such as hardening and embrittlement. In this work, RIS tendencies in face centered cubic (fcc) Ni-X (X = Cr, Fe, Ti, Mn, Si, P) dilute binary alloys are examined. The goal is to investigate the driving forces and kinetic mechanisms behind the experimentally observed segregation. By means of ab initio calculations, point-defect stabilities and interactions with solutes are determined, together with migration energies and attempt frequencies.Transport and diffusion coefficients are then calculated in a mean-field framework, to get a full picture of solutedefect kinetic coupling in the alloys. Results show that all solutes considered, with the exception of Cr, prefer vacancy-mediated over interstitial-mediated diffusion during both thermal and radiation-induced migration. Cr, on the other hand, preferentially migrates in a mixed-dumbbell configuration. P and Si are here shown to be enriched, and Fe and Mn to be depleted at sinks during irradiation of the material. Ti and Cr, on the other hand, display a crossover between enrichment at lower temperatures, and depletion in the higher temperature range.Results in this work are compared with previous studies in body centered cubic (bcc) Fe, and discussed in the context of RIS in austenitic alloys.

Published
2021

3. Wegner-Wilson loops in string nets

Author

Anna Ritz-Zwilling, Jean-Noël Fuchs, Julien Vidal, Laboratoire de Physique Théorique de la Matière Condensée (LPTMC), and Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
High Energy Physics - Theory, Phase transition, deconfinement, High Energy Physics::Lattice, Phase (waves), FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, String (physics), Electronic structure and strongly correlated systems, Condensed Matter - Strongly Correlated Electrons, 0103 physical sciences, 010306 general physics, Quantum, dimension: quantum, Mathematical physics, Physics, Quantum Physics, Strongly Correlated Electrons (cond-mat.str-el), Fluxon, Tension (physics), string tension, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], phase: topological, Function (mathematics), Limiting, critical phenomena, tension, 021001 nanoscience & nanotechnology, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], High Energy Physics - Theory (hep-th), Quantum Physics (quant-ph), 0210 nano-technology
Abstract

We study the Wegner-Wilson loops in the string-net model of Levin and Wen in the presence of a string tension. The latter is responsible for a phase transition from a topological deconfined phase (weak tension) to a trivial confined phase (strong tension). We analyze the behavior of all Wegner-Wilson loops in both limiting cases for an arbitrary input theory of the string-net model. Using a fluxon picture, we compute perturbatively the first contributions to a perimeter law in the topological phase as a function of the quantum dimensions. In the trivial phase, we find that Wegner-Wilson loops obey a modified area law, in agreement with a recent mean-field approach., 5 pages, 3 figures, published version

Published
2021

4. La créativité en équipe diversifiée: une stratégie payante ?

Author

Arielle Syssau, Julien Vidal, Adil Yakhloufi, Emmanuelle Brigaud, Dynamique des capacités humaines et des conduites de santé (EPSYLON), Université de Montpellier (UM)-Université Paul-Valéry - Montpellier 3 (UPVM)-Université Montpellier 1 (UM1), and Université Montpellier 1 (UM1)-Université Paul-Valéry - Montpellier 3 (UPVM)-Université de Montpellier (UM)

Subjects
0502 economics and business, 05 social sciences, [SHS.PSY]Humanities and Social Sciences/Psychology, 050109 social psychology, 0501 psychology and cognitive sciences, Psychology, Humanities, 050203 business & management, General Psychology
Abstract

International audience; Alors que les budgets dans les sections de Recherche et Développement en entreprise augmentent d’année en année, il convient de se demander si les stratégies utilisées pour développer la créativité sont réellement efficaces. Bien souvent en entreprise, le travail créatif se fait dans le cadre de collaboration en équipes où sont réunis des individus provenant d’horizons différents, que ce soit sur des aspects démographiques (par ex., l’âge) ou plus discrets (par ex., l’éducation). Si la raison évidente de cette mixité est de promouvoir et de confronter une pluralité des regards sur le problème posé, les données issues de la littérature scientifique laissent paraître un enthousiasme plus réservé. Dans cette revue théorique, nous proposons de récapituler les grandes lignes de l’histoire scientifique de la créativité et notamment de son attribution au seul domaine des capacités de l’individu, pour aboutir à une prise en compte de l’environnement social (Amabile, 1983). Nous traiterons ensuite de l’application de ce changement de perspective au travers d’un questionnement sur la gestion de la diversité quand un effort créatif collectif est attendu. L’objectif poursuivi étant de mettre en relief l’importance de moduler la stratégie de gestion de l’équipe en fonction des étapes d’avancement du projet créatif, selon qu’il soit attendu de produire quelque chose de nouveau, en début de projet, ou quelque chose d’utile, en fin de projet

Published
2020

5. Virtual reality for elderly with breast cancer: Usefulness and acceptance

Author

Julien Vidal, Aude Michel, Florence Cousson-Gélie, Emmanuelle Brigaud, Nathalie Blanc, Dynamique des capacités humaines et des conduites de santé (EPSYLON), Université Paul-Valéry - Montpellier 3 (UPVM), Université Montpellier 1 (UM1)-Université Paul-Valéry - Montpellier 3 (UPVM)-Université de Montpellier (UM), Université de Montpellier (UM)-Université Paul-Valéry - Montpellier 3 (UPVM)-Université Montpellier 1 (UM1), Clinique Clémentville [Montpellier], and Institut du Cancer de Montpellier (ICM)

Subjects
020205 medical informatics, Population, [SHS.PSY]Humanities and Social Sciences/Psychology, Breast Neoplasms, 02 engineering and technology, Virtual reality, Medical care, 03 medical and health sciences, 0302 clinical medicine, Breast cancer, 0202 electrical engineering, electronic engineering, information engineering, medicine, Immersion (virtual reality), Humans, 030212 general & internal medicine, education, Biological Psychiatry, ComputingMilieux_MISCELLANEOUS, Aged, education.field_of_study, Virtual Reality, Middle Aged, medicine.disease, 3. Good health, Neuropsychology and Physiological Psychology, Anxiety, Female, Neurology (clinical), Geriatrics and Gerontology, medicine.symptom, Older people, Psychology, Social psychology
Abstract

Because virtual reality seems to be increasingly considered in different medical fields, the objective of this study is to define the optimal conditions for its use in a population of elderly women with breast cancer. By using a questionnaire, we evaluated the interest but also the immersive aspirations and preferences of elderly women with regard to this innovative device, taking into account the possible changes with age (60-65 years; 66-69, 70 and over). Surprisingly, older people - whatever the age group - are particularly favorable to virtual reality without actually having experienced it. The patients primarily chose immersion in a natural environment (with a marked preference for mountain landscapes) accompanied by musical background or even guided relaxation. However, because they judged important to remain focused on the treatments, the patients especially expect VR to regulate their negative emotions (lowering anxiety) and to allow them to escape from the painful contingencies of the real. Thus, virtual reality must take them into a magical world, which is more salient than to distract them or make them laugh. The distracting power, commonly associated with VR, does not seem to be the most popular reason to use with seniors facing medical care.

Published
2019

6. Flexible thermoelectric device based on TiS2(HA)x n-type nanocomposite printed on paper

Author

Bernard Ratier, Didier Noël, Salim Ferhat, Julien Vidal, Bruno Lucas, Christophe Domain, RF-ELITE : RF-Electronique Imprimée pour les Télécommunications et l'Energie (XLIM-RFEI), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Matériaux et Mécanique des Composants (EDF R&D MMC), EDF R&D (EDF R&D), and EDF (EDF)-EDF (EDF)

Subjects
Materials science, Context (language use), Nanotechnology, 02 engineering and technology, Substrate (printing), 010402 general chemistry, 01 natural sciences, 7. Clean energy, [SPI.MAT]Engineering Sciences [physics]/Materials, Biomaterials, chemistry.chemical_compound, Thermoelectric effect, Materials Chemistry, Electrical and Electronic Engineering, Nanocomposite, Energy demand, Titanium disulfide, General Chemistry, Atmospheric temperature range, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermoelectric materials, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, chemistry, 0210 nano-technology
Abstract

International audience; Flexible and lightweight printed thermoelectric devices are becoming increasingly attractive with the advent of ubiquitous sensing and within the context of an increasing energy demand and the associated environmental issues. In this study, flexible thermoelectric devices based on efficient solution-processed organic/hybrid thermoelectric materials have been successfully patterned. The n-type component hexylammonium titanium disulfide (TiS2(HA)x) nanocomposite reaches a ZT of 0.08 ± 0.06 at room temperature and was successfully printed on a flexible substrate using inkjet technology which yielded a functional device. The device operates in a near-ambient temperature range and retains its performance under mechanical bending, demonstrating thus the flexible properties of the device.

Published
2019

7. Landau levels in quasicrystals

Author

Julien Vidal, Rémy Mosseri, Jean-Noël Fuchs, Laboratoire de Physique Théorique de la Matière Condensée (LPTMC), and Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)

Subjects
Physics, Condensed matter physics, Strongly Correlated Electrons (cond-mat.str-el), Quasicrystal, FOS: Physical sciences, 02 engineering and technology, Landau quantization, Disordered Systems and Neural Networks (cond-mat.dis-nn), Condensed Matter - Disordered Systems and Neural Networks, 021001 nanoscience & nanotechnology, 01 natural sciences, Magnetic flux, Magnetic field, Condensed Matter - Strongly Correlated Electrons, Effective mass (solid-state physics), Dispersion relation, 0103 physical sciences, Exponent, 010306 general physics, 0210 nano-technology, Quantum tunnelling, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]
Abstract

Two-dimensional tight-binding models for quasicrystals made of plaquettes with commensurate areas are considered. Their energy spectrum is computed as a function of an applied perpendicular magnetic field. Landau levels are found to emerge near band edges in the zero-field limit. Their existence is related to an effective zero-field dispersion relation valid in the continuum limit. For quasicrystals studied here, an underlying periodic crystal exists and provides a natural interpretation to this dispersion relation. In addition to the slope (effective mass) of Landau levels, we also study their width as a function of the magnetic flux per plaquette and identify two fundamental broadening mechanisms: (i) tunneling between closed cyclotron orbits and (ii) individual energy displacement of states within a Landau level. Interestingly, the typical broadening of the Landau levels is found to behave algebraically with the magnetic field with a nonuniversal exponent., Comment: 14 pages, 9 figures

Published
2018

8. Presentation of the PyDEF post-treatment Python software to compute publishable charts for defect energy formation

Author

Camille Latouche, Emmanuel V. Péan, Stéphane Jobic, Julien Vidal, Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), and Université de Nantes (UN)-Université de Nantes (UN)

Subjects
business.industry, Computer science, General Physics and Astronomy, Fermi energy, 02 engineering and technology, Python (programming language), 021001 nanoscience & nanotechnology, Atomic species, 01 natural sciences, Computational science, Software, 0103 physical sciences, Density of states, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physical and Theoretical Chemistry, Post treatment, 010306 general physics, 0210 nano-technology, Spurious relationship, business, computer, ComputingMilieux_MISCELLANEOUS, Graphical user interface, computer.programming_language
Abstract

In this paper we present a new software, Python for Defect Energy Formation (PyDEF), especially dedicated to the calculation of defect formation energy including its various corrections as developed by the theoretical community through the years. This program offers an intuitive graphical user interface which allows one to easily compute the corrected formation energy of any defect using theoretical calculation results. PyDEF is particularly suited for semiconductor materials as it includes finite size error corrections due to spurious intercell interactions as it is able to plot the formation energy of the different charge states and to determine the more stable ones as a function of the Fermi energy. Moreover PyDEF is able to plot Density Of States (DOS) with various parameters such as the projection on atoms or atomic species allowing a more comprehensive representation of defect-related electronic states. This software is developed in such a way that even non specialist or coder can use it and easily and quickly obtain reliable results.

Published
2017

9. Hofstadter butterfly of a quasicrystal

Author

Jean-Noël Fuchs, Julien Vidal, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Théorique de la Matière Condensée (LPTMC), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [PHYS]Physics [physics], Condensed matter physics, Condensed Matter - Mesoscale and Nanoscale Physics, Quasicrystal, FOS: Physical sciences, 02 engineering and technology, Quantum Hall effect, 021001 nanoscience & nanotechnology, 01 natural sciences, Condensed Matter - Other Condensed Matter, symbols.namesake, Quantum mechanics, Quasiperiodic function, 0103 physical sciences, Energy spectrum, Butterfly, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), symbols, Perpendicular magnetic field, 010306 general physics, 0210 nano-technology, Hamiltonian (quantum mechanics), Other Condensed Matter (cond-mat.other)
Abstract

The energy spectrum of a tight-binding Hamiltonian is studied for the two-dimensional quasiperiodic Rauzy tiling in a perpendicular magnetic field. This spectrum known as a Hofstadter butterfly displays a very rich pattern of bulk gaps that are labeled by four integers, instead of two for periodic systems. The role of phason-flip disorder is also investigated in order to extract genuinely quasiperiodic properties. This geometric disorder is found to only preserve main quantum Hall gaps., 9 pages, 5 figures, published version

Published
2016

10. Bound states in string nets

Author

Julien Vidal, Sébastien Dusuel, Marc Schulz, Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Théorique et Modèles Statistiques ( LPTMS ), and Université Paris-Sud - Paris 11 ( UP11 ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
High Energy Physics - Theory, 05.30.Pr, Binding energy, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, [ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th], 75.10.Jm, Condensed Matter - Strongly Correlated Electrons, symbols.namesake, High Energy Physics - Lattice, Lattice (order), Quantum mechanics, 0103 physical sciences, Bound state, [ PHYS.PHYS.PHYS-GEN-PH ] Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], 010306 general physics, Quantum, dimension: quantum, lattice, energy: low, Physics, Quantum Physics, Strongly Correlated Electrons (cond-mat.str-el), string tension, [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat], [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], High Energy Physics - Lattice (hep-lat), [ PHYS.HLAT ] Physics [physics]/High Energy Physics - Lattice [hep-lat], phase: topological, 71.10.Pm, 16. Peace & justice, 021001 nanoscience & nanotechnology, binding energy, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Hamiltonian, bound state, High Energy Physics - Theory (hep-th), 03.65.Ge, symbols, Quantum Physics (quant-ph), 0210 nano-technology, Hamiltonian (quantum mechanics)
Abstract

We discuss the emergence of bound states in the low-energy spectrum of the string-net Hamiltonian in the presence of a string tension. In the ladder geometry, we show that a single bound state arises either for a finite tension or in the zero-tension limit depending on the theory considered. In the latter case, we perturbatively compute the binding energy as a function of the total quantum dimension. We also address this issue in the honeycomb lattice where the number of bound states in the topological phase depends on the total quantum dimension. Finally, the internal structure of these bound states is analyzed in the zero-tension limit., 5 pages, 3 figures, published version

Published
2016

11. Phase diagram of an extended quantum dimer model on the hexagonal lattice

Author

Julien Vidal, Grégoire Misguich, Thomas Barthel, Rémy Mosseri, Thiago M. Schlittler, Laboratoire de Physique Théorique de la Matière Condensée (LPTMC), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Duke University [Durham], 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), ANR-12-JS04-0010,LNAQM,Approche de grand-N pour les systèmes antiferromagnétiques quantiques(2012), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Condensed matter physics, Strongly Correlated Electrons (cond-mat.str-el), Quantum Monte Carlo, General Physics and Astronomy, Flux, FOS: Physical sciences, 02 engineering and technology, 021001 nanoscience & nanotechnology, Kinetic energy, 01 natural sciences, 3. Good health, Condensed Matter - Strongly Correlated Electrons, Fractal, Cascade, Quantum mechanics, 0103 physical sciences, Hexagonal lattice, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], 010306 general physics, 0210 nano-technology, Quantum, Phase diagram
Abstract

We introduce a quantum dimer model on the hexagonal lattice that, in addition to the standard three-dimer kinetic and potential terms, includes a competing potential part counting dimer-free hexagons. The zero-temperature phase diagram is studied by means of quantum Monte Carlo simulations, supplemented by variational arguments. It reveals some new crystalline phases and a cascade of transitions with rapidly changing flux (tilt in the height language). We analyze perturbatively the vicinity of the Rokhsar-Kivelson point, showing that this model has the microscopic ingredients needed for the "devil's staircase" scenario [E. Fradkin et al., Phys. Rev. B 69, 224415 (2004)], and is therefore expected to produce fractal variations of the ground-state flux., Comment: Published version. 5 pages + 8 (Supplemental Material), 31 references, 10 color figures

Published
2015

12. Effects of the Heating Current Polarity on the Writing of Thermally Assisted Switching-MRAM

Author

Ken Mackay, Julien Vidal, I. L. Prejbeanu, Claire Creuzet, C. Portemont, Jérémy Alvarez-Hérault, Antoine Chavent, Bernard Dieny, Ricardo Sousa, Jeremy Pereira, SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-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), and CROCUS Technology

Subjects
Magnetoresistive random-access memory, Materials science, Nuclear magnetic resonance, business.industry, Polarity (physics), Optoelectronics, Electrical and Electronic Engineering, Current (fluid), [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], business, ComputingMilieux_MISCELLANEOUS, Electronic, Optical and Magnetic Materials
Abstract

International audience

Published
2014

13. Ising anyons with a string tension

Author

M. D. Schulz, Grégoire Misguich, Julien Vidal, Sébastien Dusuel, Kai Phillip Schmidt, 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), Institut de Recherche et Développement sur l'Energie Photovoltaïque (IRDEP), 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)-EDF R&D (EDF R&D), and EDF (EDF)-EDF (EDF)

Subjects
High Energy Physics - Theory, Anyon, FOS: Physical sciences, 01 natural sciences, Topological quantum computer, 010305 fluids & plasmas, Condensed Matter - Strongly Correlated Electrons, Theoretical physics, High Energy Physics - Lattice, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Quantum mechanics, Lattice (order), 0103 physical sciences, 010306 general physics, Quantum, Physics, Quantum Physics, Strongly Correlated Electrons (cond-mat.str-el), [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat], [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], High Energy Physics - Lattice (hep-lat), Condensed Matter Physics, Electronic, Optical and Magnetic Materials, High Energy Physics - Theory (hep-th), [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Quasiparticle, Ising model, Quantum Physics (quant-ph), Series expansion
Abstract

We consider the string-net model on the honeycomb lattice for Ising anyons in the presence of a string tension. This competing term induces a nontrivial dynamics of the non-Abelian anyonic quasiparticles and may lead to a breakdown of the topological phase. Using high-order series expansions and exact diagonalizations, we determine the robustness of this doubled Ising phase which is found to be separated from two gapped phases. An effective quantum dimer model emerges in the large tension limit giving rise to two different translation symmetry-broken phases. Consequently, we obtain four transition points, two of which are associated with first-order transitions whereas the two others are found to be continuous and provide examples of recently proposed Bose condensation for anyons., 10 pages, 8 figures, typos corrected

Published
2014

14. Theoretical study of optical properties of anti phase domains in GaP

Author

Laurent Pedesseau, Jean-Marc Jancu, Olivier Durand, Eric Tea, Jean-François Guillemoles, Julien Vidal, Jacky Even, Charles Cornet, Sana Laribi, Fonctions Optiques pour les Technologies de l'informatiON (FOTON), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université européenne de Bretagne - European University of Brittany (UEB)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-Télécom Bretagne, Institut de Recherche et Développement sur l'Energie Photovoltaïque (IRDEP), EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF)-Centre National de la Recherche Scientifique (CNRS)-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), Université de Rennes (UR)-Université européenne de Bretagne - European University of Brittany (UEB)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne-Centre National de la Recherche Scientifique (CNRS), 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)-EDF R&D (EDF R&D), and EDF (EDF)-EDF (EDF)

Subjects
Solar cells, Materials science, III-V semiconductors, Silicon, Band gap, General Physics and Astronomy, chemistry.chemical_element, 02 engineering and technology, Nitride, 01 natural sciences, 7. Clean energy, Gallium arsenide, Photonic bandgap materials, chemistry.chemical_compound, 0103 physical sciences, Thin film, Wave functions, 010302 applied physics, Silicon photonics, Condensed matter physics, Optical properties, Heterojunction, 021001 nanoscience & nanotechnology, Semimetal, chemistry, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, 0210 nano-technology
Abstract

International audience; III-V/Si heterostructures are currently investigated for silicon photonics and solar energy conversion. In particular, dilute nitride alloy GaAsPN grown on a GaP/Si platform exhibits lattice match with Si and an optimal band gap configuration for tandem solar cell devices. However, monolithic "coherent" growth of the GaP thin layer on Si suffers from the nucleation of extended structural defects, which can hamper device operation as well as the GaP/Si interface level and through their propagation inside the overall heterostructure. However, the effect of such structural defects on optical and transport properties is actually not well understood in details. In this letter, we investigate the anti phase domains defect (also called inversion domains) by means of ab initio calculations giving insights into the alteration of optical and transport properties of GaP due to the defective GaP/Si interface.

Published
2014

15. Feedback mechanism for the stability of the band gap of CuInSe2

Author

Levent Gütay, Alex Redinger, Yasuhiro Aida, Christiane Stephan, Sabina Caneva, Julien Vidal, Susan Schorr, David Regesch, Valérie Depredurand, Jes K. Larsen, Silvana Botti, Susanne Siebentritt, Laboratory for Photovoltaics Luxembourg, University of Luxembourg [Luxembourg], Crystallography Lab [Berlin], Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB), Physics Department, King‘s College London, Laboratoire de Physique de la Matière Condensée et Nanostructures (LPMCN), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Solides Irradiés (LSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), European Theoretical Spectroscopy Facility (ETSF), European Theoretical Spectroscopy Facility, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)

Subjects
010302 applied physics, Materials science, Band gap, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Stability (probability), Electronic, Optical and Magnetic Materials, Theoretical physics, Chemical physics, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, 0210 nano-technology, Mechanism (sociology), ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2012

16. Band structures of delafossite transparent conductive oxides from a self-consistent GW approach

Author

Julien Vidal, Silvana Botti, F. Trani, Miguel A. L. Marques, Laboratoire de Physique de la Matière Condensée et Nanostructures (LPMCN), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Solides Irradiés (LSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche et Développement sur l'Energie Photovoltaïque (IRDEP), 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)-EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)

Subjects
Physics, Condensed matter physics, Band gap, Oscillator strength, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Hybrid functional, Delafossite, Absorption edge, 0103 physical sciences, engineering, Quasiparticle, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Direct and indirect band gaps, Atomic number, 010306 general physics, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

We present a comparative study of the electronic band structures of the compounds CuMO2 M=B,Al,In,Ga which belong to the family of delafossite transparent conductive oxides. The theoretical approaches we use are the standard local-density approximation LDA to density-functional theory, LDA + U, hybrid functionals, and perturbative GW on top of LDA or self-consistent Coulomb hole plus screened exchange calculations. The latter approach, state-of-the-art theoretical approach for quasiparticle band structures, predicts direct band gaps that are compatible with experimental optical gaps only after including the strong polaronic and excitonic effects present in these materials. For what concerns the so-called band-gap anomaly of delafossite compounds, we find that GW approaches yield the same qualitative trends with increasing anion atomic number as the LDA: accounting for the oscillator strength at the absorption edge is the key to explain the experimental trend. None of the methods that we applied beyond the simple LDA is in agreement with the small indirect gaps found by many early experiments. This supports the recent view that the absorption bands identified as a sign of the indirect experimental gaps are likely due to defect states in the gap and are not a property of the pristine material.

Published
2010

17. Entanglement in a second order quantum phase transition

Author

Rémy Mosseri, Julien Vidal, Guillaume Palacios, Groupe de Physique des Solides (GPS), and Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Quantum phase transition, Physics, Quantum Physics, Spins, Condensed matter physics, Strongly Correlated Electrons (cond-mat.str-el), FOS: Physical sciences, Quantum entanglement, Lambda, 01 natural sciences, Atomic and Molecular Physics, and Optics, 010305 fluids & plasmas, Magnetic field, Condensed Matter - Strongly Correlated Electrons, Singularity, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Critical point (thermodynamics), Quantum mechanics, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, 010306 general physics, Ground state, Quantum Physics (quant-ph)
Abstract

We consider a system of mutually interacting spin 1/2 embedded in a transverse magnetic field which undergo a second order quantum phase transition. We analyze the entanglement properties and the spin squeezing of the ground state and show that, contrarily to the one-dimensional case, a cusp-like singularity appears at the critical point $\lambda_c$, in the thermodynamic limit. We also show that there exists a value $\lambda_0 \geq \lambda_c$ above which the ground state is not spin squeezed despite a nonvanishing concurrence., Comment: 4 pages, 4 EPS figures, minor corrections added and title changed

Published
2004

18. Entanglement dynamics in the Lipkin-Meshkov-Glick model

Author

Guillaume Palacios, Claude Aslangul, Julien Vidal, Groupe de Physique des Solides (GPS), and Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Condensed Matter::Quantum Gases, Quantum Physics, Quantum discord, Quantum dynamics, FOS: Physical sciences, Semiclassical physics, Concurrence, Quantum entanglement, Squashed entanglement, 01 natural sciences, Atomic and Molecular Physics, and Optics, 010305 fluids & plasmas, Condensed Matter - Other Condensed Matter, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Quantum mechanics, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, Statistical physics, Quantum Physics (quant-ph), 010306 general physics, Amplitude damping channel, Quantum statistical mechanics, Other Condensed Matter (cond-mat.other)
Abstract

The dynamics of the one-tangle and the concurrence is analyzed in the Lipkin-Meshkov-Glick model which describes many physical systems such as the two-mode Bose-Einstein condensates. We consider two different initial states which are physically relevant and show that their entanglement dynamics are very different. A semiclassical analysis is used to compute the one-tangle which measures the entanglement of one spin with all the others, whereas the frozen-spin approximation allows us to compute the concurrence using its mapping onto the spin squeezing parameter., Comment: 11 pages, 11 EPS figures, published version

Published
2004

19. Quantum dynamics in high codimension tilings: from quasiperiodicity to disorder

Author

Nicolas Destainville, Rémy Mosseri, Julien Vidal, Groupe de Physique des Solides (GPS), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Physique Statistique des Systèmes Complexes (LPT) (PhyStat), Laboratoire de Physique Théorique (LPT), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées

Subjects
Physics, Topological complexity, Pure mathematics, Mathematics::Commutative Algebra, Quantum dynamics, FOS: Physical sciences, Quasicrystal, Disordered Systems and Neural Networks (cond-mat.dis-nn), Codimension, Condensed Matter - Disordered Systems and Neural Networks, 01 natural sciences, 010305 fluids & plasmas, Quasiperiodicity, Mathematics::Algebraic Geometry, Quasiperiodic function, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, Exponent, Limit (mathematics), 010306 general physics
Abstract

We analyze the spreading of wavepackets in two-dimensional quasiperiodic and random tilings as a function of their codimension, i.e. of their topological complexity. In the quasiperiodic case, we show that the diffusion exponent that characterizes the propagation decreases when the codimension increases and goes to 1/2 in the high codimension limit. By constrast, the exponent for the random tilings is independent of their codimension and also equals 1/2. This shows that, in high codimension, the quasiperiodicity is irrelevant and that the topological disorder leads in every case, to a diffusive regime, at least in the time scale investigated here., Comment: 4 pages, 5 EPS figures

Published
2003

20. Optimization of the derivative expansion in the nonperturbative renormalization group

Author

Bertrand Delamotte, Léonie Canet, Dominique Mouhanna, Julien Vidal, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Groupe de Physique des Solides (GPS)

Subjects
High Energy Physics - Theory, Nuclear and High Energy Physics, Critical phenomena, FOS: Physical sciences, 01 natural sciences, Renormalization, High Energy Physics - Phenomenology (hep-ph), Quantum mechanics, 0103 physical sciences, Functional renormalization group, Sensitivity (control systems), [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], 010306 general physics, Condensed Matter - Statistical Mechanics, Mathematical physics, Physics, Statistical Mechanics (cond-mat.stat-mech), 010308 nuclear & particles physics, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Density matrix renormalization group, Order (ring theory), Renormalization group, High Energy Physics - Phenomenology, High Energy Physics - Theory (hep-th), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Critical exponent
Abstract

We study the optimization of nonperturbative renormalization group equations truncated both in fields and derivatives. On the example of the Ising model in three dimensions, we show that the Principle of Minimal Sensitivity can be unambiguously implemented at order $\partial^2$ of the derivative expansion. This approach allows us to select optimized cut-off functions and to improve the accuracy of the critical exponents $\nu$ and $\eta$. The convergence of the field expansion is also analyzed. We show in particular that its optimization does not coincide with optimization of the accuracy of the critical exponents., Comment: 13 pages, 9 PS figures, published version

Published
2003

21. Nonperturbative renormalization group approach to the Ising model: a derivative expansion at order $\partial^4$

Author

Léonie Canet, Bertrand Delamotte, Dominique Mouhanna, Julien Vidal, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Groupe de Physique des Solides (GPS)

Subjects
Physics, High Energy Physics - Theory, Statistical Mechanics (cond-mat.stat-mech), 010308 nuclear & particles physics, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Density matrix renormalization group, Critical phenomena, FOS: Physical sciences, Order (ring theory), Renormalization group, 16. Peace & justice, 01 natural sciences, High Energy Physics - Theory (hep-th), Quantum mechanics, 0103 physical sciences, Functional renormalization group, Ising model, [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], 010306 general physics, Critical exponent, Critical dimension, Condensed Matter - Statistical Mechanics
Abstract

On the example of the three-dimensional Ising model, we show that nonperturbative renormalization group equations allow one to obtain very accurate critical exponents. Implementing the order $\partial^4$ of the derivative expansion leads to $\nu=0.632$ and to an anomalous dimension $\eta=0.033$ which is significantly improved compared with lower orders calculations., Comment: 4 pages, 3 figures

Published
2003

22. Strongly correlated hopping and many-body bound states

Author

Julien Vidal, Benoit Douçot, Groupe de Physique des Solides (GPS), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Pierre Aigrain (LPA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Electron density, Condensed matter physics, Strongly Correlated Electrons (cond-mat.str-el), Quantum dynamics, FOS: Physical sciences, Electron, 01 natural sciences, Many body, 010305 fluids & plasmas, Condensed Matter - Strongly Correlated Electrons, Quantum mechanics, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, Bound state, 010306 general physics, Particle density
Abstract

We study a system in which the quantum dynamics of electrons depend on the particle density in their neighborhood. For any on-site repulsive interaction, we show that the exact two-body and three-body ground states are bound states. We also discuss the finite density case in a mean-field framework and we show that the system can undergo an unusual transition from an effective attractive interaction to a repulsive one, when varying the electron density., 6 pages, 6 EPS figures, minor modifications and references added

Published
2002

23. Interaction induced delocalisation for two particles in a periodic potential

Author

P. Butaud, Benoît Douçot, Julien Vidal, Rémy Mosseri, Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Groupe de Physique des Solides (GPS), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherches sur les Très Basses Températures (CRTBT), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Strongly Correlated Electrons (cond-mat.str-el), Condensed matter physics, FOS: Physical sciences, General Physics and Astronomy, Flux, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Periodic potential, Magnetic field, Condensed Matter - Strongly Correlated Electrons, Delocalized electron, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, 010306 general physics, 0210 nano-technology
Abstract

We consider two interacting particles evolving in a one-dimensional periodic structure embedded in a magnetic field. We show that the strong localization induced by the magnetic field for particular values of the flux per unit cell is destroyed as soon as the particles interact. We study the spectral and the dynamical aspects of this transition., 4 pages, 5 EPS figures, minor misprints corrected

Published
2000

24. Conditionnement évaluatif et publicité

Author

Syssau Vaccarella, Arielle, Bouy, J., Dynamique des capacités humaines et des conduites de santé (EPSYLON), Université de Montpellier (UM)-Université Paul-Valéry - Montpellier 3 (UPVM)-Université Montpellier 1 (UM1), Nathalie Blanc, and Julien Vidal

Subjects
[SHS.PSY]Humanities and Social Sciences/Psychology, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2009

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