Journal
NANO LETTERS
Volume 23, Issue 7, Pages 2476-2482Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c03794
Keywords
topological crystalline insulators; Hartree-Fock; topological edge states; strong correlations in flat bands
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Step edges of topological crystalline insulators in Pb1-xSnxSe were studied using scanning tunneling microscopy and spectroscopy. When the energy position of the step edge approaches the Fermi level, a correlation gap opens up. The experimental results suggest that the interaction effects are enhanced due to the collapsing of electronic density into a one-dimensional channel, providing a unique system to study the intertwining of topology and many-body electronic effects. Theoretical modeling was performed through a Hartree-Fock analysis.
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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