Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 76: Electronic structure of surfaces: Spectroscopy, surface states II

O 76.3: Vortrag

Donnerstag, 12. März 2026, 11:00–11:15, HSZ/0201

Spin-orbital signatures and topological evolution in the Mo_xW_1−xTe₂ alloy — •Sarath Sasi¹, Aki Pulkkinen¹, Raphaël Salazar¹, Jakub Schusser¹, Laurent Nicolaï¹, Christine Ritcher^2,3, and Karol Hricovini^2,3 — ¹New Technologies Research Centre, University of West Bohemia, Pilsen, Czech Republic — ²LPMS, CY Cergy Paris Université, Neuville-sur-Oise, France — ³Université Paris-Saclay, CEA, CNRS, LIDYL, Gif-sur-Yvette, France

We examine how compositional disorder modifies the electronic structure of the transition-metal dichalcogenide alloy Mo_xW_1−xTe₂[1], with particular attention to the evolution of band topology and the persistence of Type-II Weyl features. Using high-resolution spin-polarized ARPES and circular-dichroism ARPES provides complementary insights into the spin and orbital character of the electronic states. These measurements give insight into its intrinsic spin-orbital properties compared to WTe₂[2], and for identifying how alloying is affecting its properties, like Berry curvature. Together with fully relativistic one-step photoemission calculations within the SPR-KKR[3] framework, we yield a detailed picture of how alloying tunes the electronic structure and topological responses in this family of quantum materials.

[1] Belopolski, I., Sanchez, D., Ishida, Y., et al. Nat. Commun. 7, 13643 (2016).

[2] Heider, T., Bihlmayer, G., Schusser, J., et al. Phys. Rev. Lett. 130, 146401 (2023).

[3] Braun, J., Minar, J., Ebert, H. Physics Reports, 740 (2018).

Keywords: 2D materials; ARPES; Electronic structure; TMDC; Spectroscopy