New topological surface state in layered topological insulators: Unoccupied dirac cone View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2013-02-27

AUTHORS

S. V. Eremeev, I. V. Silkin, T. V. Menshchikova, A. P. Protogenov, E. V. Chulkov

ABSTRACT

The unoccupied states in topological insulators Bi2Se3, PbSb2Te4, and Pb2Bi2Te2S3 are studied by the density functional theory methods. It is shown that a surface state with linear dispersion emerges in the inverted conduction band energy gap at the center of the surface Brillouin zone on the (0001) surface of these insulators. The alternative expression of ℤ2 invariant allowed us to show that a necessary condition for the existence of the second \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\bar \Gamma $\end{document} Dirac cone is the presence of local gaps at the time reversal invariant momentum points of the bulk spectrum and change of parity in one of these points. More... »

PAGES

780-784

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0021364012240034

DOI

http://dx.doi.org/10.1134/s0021364012240034

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1052820817


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