Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 22: 2D Materials II: Electronic Structure (joint session O/TT)
O 22.5: Talk
Tuesday, March 19, 2024, 11:45–12:00, MA 005
Photon energy dependence of circular dichroism in the topologically nontrivial surface states of WTe2 — •Aki Pulkkinen1, Ján Minár1, Shoresh Soltani2, Khadiza Ali2, Craig Polley2, Balasubramanian Thiagarajan2, and Saroj Dash2 — 1New Technologies-Research Centre, University of West Bohemia, Pilsen, Czech Republic — 2MAX IV Laboratory, Lund University, Lund, Sweden
We present a theoretical and experimental study of the distorted octahedral transition metal dichalcogenide Td-WTe2, a type-II Weyl semimetal renowned for its intriguing physical properties, such as strong spin-orbit coupling, giant magnetoresistance, and superconductivity. Utilizing the full potential formulation of the one-step model of photoemission, our investigation focuses on elucidating the electronic and topological properties of WTe2. By employing the theoretical model of angle-resolved photoemission spectroscopy (ARPES) and circular dichroism (CD), our results provide detailed insights into the spin texture of electronic states near the Fermi level. These findings contribute to the ongoing exploration of WTe2, emphasizing its potential applications in quantum computing and advanced electronic devices while bridging the gap between theoretical predictions and experimental observations, including the characteristics of surface states.
Keywords: ARPES; circular dichroism; one-step model of photoemission; transition metal dichalcogenide; surface states