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New topological surface state in layered topological insulators: Unoccupied dirac cone

AuthorsEremeev, S. V.; Silkin, Igor V.; Menshchikova, Tatiana V.; Protogenov, A. P.; Chulkov, Eugene V. CSIC ORCID
Issue Date2013
CitationJETP Letters 96(12): 780-784 (2013)
AbstractThe 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 Γ 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. © 2012 Pleiades Publishing, Ltd.
Publisher version (URL)http://dx.doi.org/10.1134/S0021364012240034
Identifiersdoi: 10.1134/S0021364012240034
issn: 0021-3640
e-issn: 1098-3640
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