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O: Fachverband Oberflächenphysik

O 34: Poster Session - Topological Insulators

O 34.2: Poster

Montag, 16. März 2020, 18:15–20:00, P1C

Domain walls as possible realization of edge state coupling in a quantum spin Hall insulator — •Raul Stühler¹, André Kowalewski¹, Felix Reis¹, Johannes Weis¹, Joerg Schaefer¹, Gang Li², Werner R. Hanke¹, Dimitri Jungblut¹, Benedikt Scharf¹, Fernando Dominguez Tijero¹, Ewelina M. Hankiewicz¹, and Ralph Claessen¹ — ¹Universität Würzburg, Germany — ²ShanghaiTech University, China

The recently discovered monolayer system bismuthene/SiC(0001) is a promising candidate for the realization of a room temperature quantum spin Hall (QSH) effect. Previous experiments have established a large fundamental band gap (0.8 eV) and the existence of one-dimensional metallic edge states [1]. As expected for a QSH insulator, the electronic edge channels do not show any signs of backscattering from kinky edge sections that would manifest in interference phenomena. Notwithstanding, topological protection against defect scattering may become lifted when two helical edge channels are brought into direct proximity, resulting in quantum interference. By scanning tunneling microscopy we study phase-slip domain boundaries (DB) with limited longitudinal extent. By spectroscopic means we scrutinize quasi-particle interference along these one-dimensional topographic defects that points towards a linear electronic dispersion strongly reminiscent of a Fabry-Pérot resonator. We discuss our findings as possible quantum interference between coupled helical edge states formed in the vicinity of a DB.

[1] F. Reis et al., Science 357, 287 (2017)