Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 28: Poster Session: Topological Topics

TT 28.5: Poster

Monday, March 12, 2018, 15:00–19:00, Poster B

One-dimensional physics in the edge states of the high-temperature Quantum Spin Hall system bismuthene on SiC(0001) — •Raul Stühler, Felix Reis, Jörg Schäfer, and Ralph Claessen — Physikalisches Institut and Röntgen Research Center for Complex Material Systems, Universität Würzburg, D-97074 Würzburg, Germany

Bismuthene (a mono-atomic honeycomb lattice of Bi-atoms) chemisorbed on a SiC(0001) substrate has recently been synthesized and shown to be a promising candidate for the realization of a room-temperature Quantum Spin Hall (QSH) effect which is based on a novel QSH mechanism [1]. Experiments with angle-resolved photoelectron spectroscopy (ARPES) and scanning tunneling spectroscopy (STS) found excellent agreement with the calculated topological band structure. In particular, while the bismuthene film displays a large bulk band gap of ∼0.8eV, conducting edge states are observed at the boundaries of the honeycomb layer, e.g. at terrace steps of the substrate, as expected for a two-dimensional topological insulator (2D-TI). Here we demonstrate, by a detailed analysis of tunneling spectra, that these edge states are indeed one-dimensional (1D) and correlated in nature. The STS spectra display power law behavior with energy and temperature as well as universal scaling, consistent with the expectations for a (helical) Tomonaga-Luttinger liquid (TLL).
F. Reis, G. Li, L. Dudy et al., Science 357, 287 (2017).