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Interaction Effects in a 1D Flat Band at a Topological Crystalline Step Edge
Glenn Wagner1, Souvik Das2, Johannes Jung3
1Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
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 Pb1-SnSe 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 electronic effects intertwine, which we model theoretically through a Hartree-Fock analysis.
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