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O: Fachverband Oberflächenphysik

O 78: Poster Session VI: 2D Materials: Electronic structure, excitations, etc. II

O 78.11: Poster

Mittwoch, 3. März 2021, 13:30–15:30, P

Spin and orbital nature of electronic structure in transition metal dichalcogenides — •Jakub Schusser^1,2,3, Mauro Fanciulli¹, Samuel Beaulieu⁴, Christine Richter², Olivier Heckmann², Zakariae El Youbi^2,5, Cephise Cacho⁵, Ralph Ernstorfer⁴, Friedel Reinert³, Karol Hricovini¹, and Ján Minár² — ¹LPMS, CY Cergy-Paris University, Neuville-sur-Oise, France — ²NTC, University of West-Bohemia, Pilsen, Czech Republic — ³EP VII and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Würzburg, Germany — ⁴DPC, Fritz-Haber-Institute, Berlin, Germany — ⁵DLS, Harwell Campus, Didcot, UK

Our work is concerned with the polarization of electrons and orbital texture in non-magnetic materials. We studied stationary and dynamic electron states by photoemission and spin-polarized relativistic Korringa-Kohn-Rostoker calculations on three bulk transition metal dichalcogenide samples. On bulk WTe2, a Weyl type-II semimetal candidate, we performed spin-, time- and angle-resolved photoemission spectroscopy experiments at different pump-probe time delays to reveal the mechanism behind the relaxation process of spin-polarized electrons above the Fermi level in the supposed Weyl points region. On bulk 2H-WSe2, using different crystal orientations that are mathematically equivalent to time-reversal operation, we introduce a new observable called "time-reversal dichroism" which contains information about the hidden orbital texture of the electronic states. For 1T-HfTe2 as a model system with both inversion and time-reversal symmetries in the bulk, we performed an analysis of the spin-polarized photocurrent.