SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 18: Poster: 2D Materials I
O 18.9: Poster
Monday, March 27, 2023, 18:00–20:00, P2/EG
Designing a symmetry-correct minimal model for 2H-WSe2 — •Max Xylander1,2, Philipp Eck1,2, Simon Moser2,3, Lukasz Plucinski4, and Giorgio Sangiovanni1,2 — 1ITPA, Universität Würzburg, Germany — 2Würzburg-Dresden Cluster of Excellence, ct.qmat — 3EP4, Universität Würzburg, Germany — 4PGI-6, Peter Grünberg Institut Jülich, Germany
Transition metal dichalcogenides (TMDCs) have been studied for their structure-dependent valley physics. Due to inversion symmetry breaking in combination with strong SOC originating from the transition metal d-shell, these materials posess momentum-dependent spin splitting. Recently, the interest in TMDCs has been further stimulated by twisted moiré lattices, where the emerging flat bands have been associated to chiral representations in twisted bilayer graphene.
Here we present a study on the chiral wavefunctions in 2H-WSe2 based on ab initio calculations and minimal modeling. Especially, we will focus on an analysis of the irreducible representations, which allow us to design a minimal d-orbital tight-binding Hamiltonian with SOC and inversion symmetry breaking terms. For the validation of the model, we plan further experimental studies with circularly polarized light angle-resolved photoemission.