Dresden 2026 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 14: 2D Materials II (joint session DS/HL)
DS 14.3: Vortrag
Mittwoch, 11. März 2026, 15:30–15:45, REC/C213
Probing the Quantum Spin Hall State in Atomic Monolayers via NanoARPES — •Cedric Schmitt1,2, Lukas Gehrig1,2, Kilian Strauß1,2, Jonas Erhardt1,2, Matthew Watson3, Jörg Schäfer1,2, Simon Moser1,2,4, and Ralph Claessen1,2 — 1Physikalisches Institut, Universität Würzburg — 2Würzburg-Dresden Cluster of Excellence ct.qmat — 3Diamond Light Source, UK — 4AG Oberflächen, Ruhr-Universität Bochum
Our recently discovered quantum spin Hall insulator indenene [1], a triangular monolayer of indium on SiC(0001), exhibits a 120 meV gap and monodomain growth on the μm scale. To verify its topological nature, we use circular dichroism in ARPES as a bulk-sensitive probe of orbital angular momentum (OAM) linked to its Berry curvature [2]. Due to SiC's stepped morphology, stacking-dependent OAM cancellation complicates microARPES. We overcome this challenge using nanoARPES with sub-600 nm resolution, resolving OAM asymmetry at individual terraces of SiC. Our study establishes dichroism as a robust spectroscopic tool for topological classification within a single SiC terrace.
[1] M. Bauernfeind et al. Nat. Commun. 12, 5396 (2021)
[2] J. Erhardt et al. Phys. Rev. Lett. 132, 196401 (2024)
Keywords: Topological Insulator; Indenene; NanoARPES; Circular dichroism ARPES; SiC