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Your search keyword '"Maria Christine Richter"' showing total 2 results
Start Over Author "Maria Christine Richter" Topic 0103 physical sciences
2 results on '"Maria Christine Richter"'

1. Spin, time, and angle resolved photoemission spectroscopy on WTe2

Author

Karol Hricovini, Min-I Lee, David Bresteau, J.-F. Hergott, Zakariae El Youbi, Jakub Schusser, O. Heckmann, Jan Minár, Cephise Cacho, O. Tcherbakoff, Carlo Spezzani, Thierry Ruchon, Mauro Fanciulli, Maria Christine Richter, P. d’Oliveira, Laboratoire de Physique des Matériaux et des Surfaces (LPMS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CY Cergy Paris Université (CY), Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), University of West Bohemia [Plzeň ], DIAMOND Light source, Elettra Sincrotrone Trieste, Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Serveurs Laser (SLIC), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Electronic structure, Materials science, FOS: Physical sciences, Angle-resolved photoemission spectroscopy, 02 engineering and technology, 7. Clean energy, 01 natural sciences, Korringa-Kohn- Rostoker method, Time & angle-resolved photoemission spectroscopy, Transition metal, 0103 physical sciences, 010306 general physics, Spin-½, [PHYS]Physics [physics], Condensed Matter - Materials Science, Condensed matter physics, Spin polarization, Topological classification, Materials Science (cond-mat.mtrl-sci), Transition-metal dichalcogenide, 021001 nanoscience & nanotechnology, Spin-resolved photoemission spectroscopy, Pulse (physics), High-harmonic generation, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, Weyl semimetal
Abstract

We combined a spin-resolved photoemission spectrometer with a high-harmonic generation (HHG) laser source in order to perform spin-, time- and angle-resolved photoemission spectroscopy (STARPES) experiments on the transition metal dichalcogenide bulk WTe$_2$, a possible Weyl type-II semimetal. Measurements at different femtosecond pump-probe delays and comparison with spin-resolved one-step photoemission calculations provide insight into the spin polarization of electrons above the Fermi level in the region where Weyl points of WTe$_2$ are expected. We observe a spin accumulation above the Weyl points region, that is consistent with a spin-selective bottleneck effect due to the presence of spin polarized cone-like electronic structure. Our results support the feasibility of STARPES with HHG, which despite being experimentally challenging provides a unique way to study spin dynamics in photoemission., 6 pages, 4 figures

Published
2020
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2. Bi ultra-thin crystalline films on InAs(1 1 1) A and B substrates: a combined core-level and valence-band angle-resolved and dichroic photoemission study

Author

J-M Mariot, Thiagarajan Balasubramanian, Janusz Kanski, Uros Djukic, M. Leandersson, O. Heckmann, Juergen Braun, Jun Fujii, Ivana Vobornik, Hubert Ebert, Maria Christine Richter, Karol Hricovini, Jan Minár, Laurent Nicolaï, Janusz Sadowski, Weimin Wang, New Technologies Research Centre [Plzeň] (NTC), University of West Bohemia [Plzeň ], Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Matériaux et des Surfaces (LPMS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CY Cergy Paris Université (CY), MAX IV Lab, Fotongatan 2, S-22594 Lund, Sweden, Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Dynamique et Interactions en phase Condensée (DICO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Chalmers University of Technology [Gothenburg, Sweden], Department of Physics and Electrical Engineering, Linnaeus University, SE-391 82, Kalmar, Institute of Physics, Polish Academy of Sciences, Polska Akademia Nauk = Polish Academy of Sciences (PAN), Faculty of Physics, Warsaw University of Technology, Warsaw University of Technology [Warsaw], Department Chemie der Ludwigs-Maximilians-Universität, 81377 München, Germany, CNR Istituto Officina dei Materiali (IOM), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Elettra Sincrotrone, CNR-IMIP & INFM-TASC, Deutsche Forschungsgemeinschaft SPP1666 priority program (Grants No. EB144/26 and EB154/32), Computational and Experimental Design of Advanced Materials with New Functionalities (CZ.02.1.01/0.0/0.0/15_003/0000358), Institute of Physics Publishing Ltd, ANR-11-EQPX-0034,PATRIMEX,PATrimoines matériels : Réseau d'Instrumentation Multisites Expérimental(2011), and European Project: 312284,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2012-1,CALIPSO(2012)

Subjects
ultra-thin films, growth, electronic structure calculations, General Physics and Astronomy, Synchrotron radiation, bismuth indium arsenide growth ultra-thin films angle-resolved photoemission electronic structure calculations circular dichroism, Electronic structure, Epitaxy, Dichroic glass, indium arsenide, 01 natural sciences, Molecular physics, angle-resolved photoemission, 010305 fluids & plasmas, symbols.namesake, X-ray photoelectron spectroscopy, 0103 physical sciences, bismuth, [CHIM]Chemical Sciences, 010306 general physics, Physics, [PHYS]Physics [physics], Fermi level, circular dichroism, Brillouin zone, Electron diffraction, symbols
Abstract

The growth of Bi on both the In-terminated (A) face and the As-terminated (B) face of InAs(1 1 1) has been investigated by low-energy electron diffraction, scanning tunnelling microscopy, and photoelectron spectroscopy using synchrotron radiation. The changes upon Bi deposition of the In 4d and Bi 5d 5/2 photoelectron signals allow to get a comprehensive picture of the Bi/InAs(1 1 1) interface. From the early stage the Bi growth on the A face is epitaxial, contrary to that on the B face that proceeds via the formation of islands. Angle-resolved photoelectron spectra show that the electronic structure of a Bi deposit of ≈10 bi-layers on the A face is identical to that of bulk Bi, while more than ≈30 bi-layers are needed for the B face. Both bulk and surface electronic states observed are well accounted for by fully relativistic ab initio calculations performed using the one-step model of photoemission. These calculations are used to analyse the dichroic photoemission data recorded in the vicinity of the Fermi level around the Γ ¯ point of the Brillouin zone.

Published
2019
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