Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Nanomaterials
MM 17.7: Vortrag
Dienstag, 2. April 2019, 12:00–12:15, H46
Spin, angle and time-resolved photoemission studies of WTe2 and WSe2 — •Jakub Schusser1,2, Jan Minar2, Maria Christine Richter1, Mauro Fanculli1, Olivier Heckmann1, Laurent Nicolai2, Waly Ndiaye1, Zakariae El Youbi1, Thierry Ruchon3, David Bresteau3, and Karol Hricovini1 — 1LPMS, University of Cergy-Pontoise, Neuville-sur-Oise, France — 2University of West-Bohemia, New Technologies Centre, Pilsen, Czech Republic — 3ATTOLab, CEA, Saint-Aubin, France
Molybdenum dichalcogenides are probably the most studied single layer TMDCs by virtue of being appealing for sundry possible applications suchlike transistors, diodes, solar cells or more fundamental studies of spin or valley pseudospin and their interactions. Tungsten-based counterparts are on the other hand evincing much stronger spin-orbit coupling due to which all the spin-related effects are more stable at room temperature and thus more feasible for application. We have conducted several experiments following the evolution of the spin texture near the X, Y, K and M points of the Brillouin zone (WTe2 and WSe2 respectively) which is substantial for understanding the fundamental properties of the structure-property relation of the system. Ab-initio set of photoemission calculations was also performed using SPR-KKR package. Furthermore, TR-SARPES studies will be carried out by the group on such materials to determine the ultrafast dynamics of the carrier density and to disentangle the subsequent relaxation processes using pump-probe experiments.