Dresden 2026 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 12: 2D Materials I

DS 12.2: Vortrag

Mittwoch, 11. März 2026, 09:45–10:00, REC/C213

Radial Rashba spin-orbit fields in commensurate twisted transition-metal dichalcogenide bilayers — •Thomas Naimer¹, Paulo E. Faria Junior², Klaus Zollner¹, and Jaroslav Fabian¹ — ¹Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — ²Department of Physics, University of Central Florida, Orlando, Florida 32816, USA

In commensurate twisted homobilayers, purely radial Rashba spin-orbit fields can emerge. We employ first-principles calculations to investigate the band structures and the spin-orbit fields close to the high-symmetry points K and Γ of several commensurate twisted transition-metal dichalcogenide homobilayers: WSe₂, NbSe₂, and WTe₂. The observed in-plane spin textures can for the most part be reproduced successfully using a model Hamiltonian, enabling us to extract relevant parameters. Exploring different lateral displacements between the layers, we confirm that the relevant symmetry protecting the radial Rashba is an in-plane 180^∘ rotation axis. Our calculations on WTe₂ bilayers show that their lack of C₃ symmetry results in spin textures that are neither radial nor tangential. All authors acknowledge support by the FLAG ERA JTC 2021 project 2DSOTECH, the European Union Graphene Flagship project 2DSPIN-TECH (grant agreement No. 101135853) and SFB 1277 (Project-ID 314695032).

Keywords: transition-metal dichalcogenides; spin-orbit coupling; Radial Rashba; density functional theory