Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.28: Poster

Wednesday, September 7, 2022, 18:00–20:00, P2

"Ghupft und Gschobm": An ab initio multi-scale approach to bands and electron-phonon coupling in twisted WSe2 bilayers — •Michael Winter and Tim Wehling — I. Institute of Theoretical Physics, Universität Hamburg

Transition metal dichalcogenide bilayers host electron correlation effects like superconductivity, exciton condensation, and Mott insulation. These phenomena are tuneable via charge doping, optical excitation, dielectric environment, and twist angle. The complex interplay of Coulomb and electron-phonon interactions with multi-orbital and multi-valley physics behind the aforementioned correlation effects remains to be understood.

We study the twisted homo-bilayer of tungsten diselenide by construction of many-body quantum lattice models describing the electronic and phonon degrees of freedom as well as their coupling. From ab initio DFT and DFPT calculations with subsequent Wannier constructions on untwisted snapshots of commensurate structures corresponding lattice models are compiled. With an automated interpolation we are able to address twisted systems.