SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Poster: Topology and Symmetry-Protected Materials
O 65.6: Poster
Mittwoch, 29. März 2023, 18:00–20:00, P2/EG
Towards higher−order topological corner states in quantum spin Hall insulating heterostructures — •Markus Feld1,2, Philipp Eck1,2, and Giorgio Sangiovanni1,2 — 1ITPA, Universität Würzburg, Germany — 2Würzburg-Dresden Cluster of Excellence, ct.qmat
Real-space obstruction in Z2 trivial systems is under current investigation as it promotes quantized electronic bulk multipoles. In two dimensions it can stabilize a higher−order topological insulator (HOTI) with insulating edges and zero energy in-gap corner states. However the recent analysis for the triangular quantum spin Hall insulator (QSHI) indenene has extended the concept of real-space obstruction to ν=1 phases [1].
We show that this is in contrast to the well established large-gap QSHI bismuthene [2], where the Wannier functions center on the atomic lattice sites. Here we present an ab initio based study, where we address the edges and corners of obstructed and non-obstructed interfaces by considering heterostructures of indenene and bismuthene.
[1] P. Eck et al., Phys. Rev. B 106, 195143 (2022)
[2] F. Reis et al., Science 357, 287 (2017),