Interaction Effects in a 1D Flat Band at a Topological Crystalline Step Edge.
Nano Lett
; 23(7): 2476-2482, 2023 Apr 12.
Article
en En
| MEDLINE
| ID: mdl-36972710
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-xSnxSe 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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01-internacional
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MEDLINE
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En
Revista:
Nano Lett
Año:
2023
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Article
País de afiliación:
Suiza