Hexagonally warped Dirac cones and topological phase transition in silicene superstructure View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2013-04

AUTHORS

Motohiko Ezawa

ABSTRACT

Silicene is a monolayer of silicon atoms forming a two-dimensional honeycomb lattice. We investigate the topological properties of a silicene superstructure generated by an external periodic potential. The superstructure is a quantum spin-Hall (QSH) insulator if it is topologically connected to silicene. It is remarkable that two inequivalent K and K′ points in the silicene Brillouin zone are identified in certain superstructures. In such a case, two Dirac cones coexist at the same Dirac point in the momentum space and they are hexagonally warped by the Coulomb interaction. We carry out a numerical analysis by taking an instance of the (3 × 3) superstructure on the (4 × 4) structure of the Ag substrate. We show that it is a QSH insulator, that there exists no topological phase transition by external electric field, and that the hexagonally warping occurs in the band structure. More... »

PAGES

139

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1140/epjb/e2013-31029-1

DOI

http://dx.doi.org/10.1140/epjb/e2013-31029-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1002746924


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