Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 34: Poster Session - Topological Insulators
O 34.2: Poster
Monday, March 16, 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)