Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 76: Electronic structure of surfaces: Spectroscopy, surface states II
O 76.2: Vortrag
Donnerstag, 12. März 2026, 10:45–11:00, HSZ/0201
One-step investigation of the electronic tapestry of 2H-WSe2 — •Ridha Eddhib1, Samuel Beaulieu2, Aki Pulkkinen1, and Jan Minar1 — 1New Technologies Research Centre, University of West Bohemia, 301 00 Pilsen, Czechia — 2Université de Bordeaux-CNRS-CEA, CELIA, UMR5107, F33405 Talence, France.
Angle-resolved photoemission spectroscopy (ARPES) is a powerful tool for unraveling the electronic band structure of crystalline solids. However, the intricate and multifaceted electronic structures of complex materials often require complementary measurement strategies and careful experimental design. In our research, we employed the one-step model of photoemission, as implemented in the SPRKKR code[1], supported by experimental studies. We combined circular dichroism in photoelectron angular distributions (CDAD) with the layer-dependent symmetry properties of 2H-WSe2, which enables a time-reversal operation (TRCDAD)[2]. This approach quantifies the modulation of photoemission intensity across a wide energy range, providing detailed insight into the material's fine electronic structure while suppressing extrinsic contributions to the photoemission cross section to some extent. We present the monolayer, bilayer, and trilayer contributions to the photocurrent alongside the bulk response, while accounting for final-state effects using both time-reversed low-energy electron diffraction and a free-electron-gas final-state. [1]Ebert, H., Koedderitzsch, D., & Minar, J. (2011). Reports on Progress in Physics, 74(9), 096501. [2]Beaulieu, S., Schusser, ... & Ernstorfer, R. (2020). Physical Review Letters, 125(21), 216404.
Keywords: ARPES; TR-CDAD; SPRKKR; WSe2; One step model