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O: Fachverband Oberflächenphysik
O 101: Topology and Symmetry-protected Materials (joint session O/TT)
O 101.3: Vortrag
Freitag, 21. März 2025, 11:00–11:15, H25
Edge spectroscopy of the quantum spin Hall insulator indenene — •Jonas Erhardt1,2, Mattia Ianetti3, Gianni Profeta3, Domenico Di Sante4, Giorgio Sangiovanni2,5, Simon Moser1,2, and Ralph Claessen1,2 — 1Physikalisches Institut, Universität Würzburg — 2Würzburg-Dresden Cluster of Excellence ct.qmat — 3Department of Physical and Chemical Sciences, University of L’Aquila — 4Department of Physics and Astronomy, University of Bologna — 5Institut für Theoretische Physik und Astrophysik, Universität Würzburg
The non-trivial topology of the quantum spin Hall insulator indenene was recently demonstrated through bulk probes that reveal its topological band ordering [1,2]. According to the bulk-boundary correspondence, this ensures the existence of robust metallic states confined to the edge of this triangular indium monolayer. In this study, we employ scanning tunneling spectroscopy to investigate all three edge types of indenene for this correspondence. Our results demonstrate metallic edge density of states with suppressed backscattering near the bulk band gap, providing strong evidence for the existence of topologically protected edge states in indenene.
[1] M. Bauernfeind, J. Erhardt, and P. Eck et al., Nat. Commun. 12, 5396 (2021)
[2] J. Erhardt et al., Phys. Rev. Lett. 132, 196401 (2024)
Keywords: QSHI; Quantum spin Hall insulator; Edge spectroscopy; Scanning tunneling spectroscopy/microscopy; Quasiparticle interference