SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 8: 2D Materials II (joint session HL/CPP)

HL 8.10: Vortrag

Montag, 27. März 2023, 18:00–18:15, POT 81

Constructing minimal tight-binding models for twisted TMDC bilayers — •Michael Winter, Dominik Benner, and Tim Wehling — I. Institute of Theoretical Physics, Universität Hamburg, Notkestraße 9-11, 22607 Hamburg, Germany

Transition metal dichalcogenides bilayers attract considerable attention within the last years due to the wide range of observable correlation effects, e.g. superconductivity, exciton condensation and there-like. One possible parameter to tune these phenomena is the twist angle between the two layers.

We study the electronic structure of twisted transition metal dichalcogenides from ab initio DFT calculations and subsequent Wannier construction on untwisted snapshots of commensurate structures. By choosing a subspace of only three Wannier orbitals per transition metal, we construct a minimal model for the description of twisted bilayers.