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Edge states reconstruction from strong correlations in quantum spin Hall insulators

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arxiv 1702.06418 v1 pith:5AV4MQG5 submitted 2017-02-21 cond-mat.str-el cond-mat.mes-hall

A. Amaricci , G. Sangiovanni , L. Privitera , F. Petocchi , M. Capone , B. Trauzettel This is my paper · ORCID
classification cond-mat.str-elcond-mat.mes-hall
keywords edgereconstructionstatesbulkcorrelationscoulombhallinsulators
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We study quantum spin Hall insulators with local Coulomb interactions in the presence of boundaries using dynamical mean field theory. We investigate the different influence of the Coulomb interaction on the bulk and the edge states. Interestingly, we discover an edge reconstruction driven by electronic correlations. The reason is that the helical edge states experience Mott localization for an interaction strength smaller than the bulk one. We argue that the significance of this edge reconstruction can be understood by topological properties of the system characterized by a local Chern marker.

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