Interaction Effects in a 1D Flat Band at a Topological Crystalline Step Edge.

ABSTRACT: Step edges of topological crystalline insulators can be viewed as predecessors of higher-order topology, as they embody one-dimensional edge channels embedded in an effective three-dimensional electronic vacuum emanating from the topological crystalline insulator. Using scanning tunneling microscopy and spectroscopy, we investigate the behavior of such edge channels in Pb_1-xSn_xSe under doping. Once the energy position of the step edge is brought close to the Fermi level, we observe the opening of a correlation gap. The experimental results are rationalized in terms of interaction effects which are enhanced since the electronic density is collapsed to a one-dimensional channel. This constitutes a unique system to study how topology and many-body electroni

SUBMITTER: Wagner G 

PROVIDER: S-EPMC10103314 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature