An isolated Dirac cone on the surface of ternary tetradymite-like topological insulators

H. Lin; Tanmoy Das; L. A. Wray; S. -Y. Xu; M. Z. Hasan; A. Bansil

doi:10.1088/1367-2630/13/9/095005

An isolated Dirac cone on the surface of ternary tetradymite-like topological insulators

Materials Science 2012-05-16 v1

Authors: H. Lin , Tanmoy Das , L. A. Wray , S. -Y. Xu , M. Z. Hasan , A. Bansil

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Abstract

We have extended the search for topological insulators to the ternary tetradymite-like compounds M2X2Y (M = Bi or Sb; X and Y = S, Se or Te), which are variations of the well-known binary compounds Bi2Se3 and Bi2Te3. Our first-principles computations suggest that five existing compounds are strong topological insulators with a single Dirac cone on the surface. In particular, stoichiometric Bi2Se2S, Sb2Te2Se and Sb2Te2S are predicted to have an isolated Dirac cone on their naturally cleaved surface. This finding paves the way for the realization of the topological transport regime.

Keywords

topological insulators isolated Dirac cone ternary tetradymite compounds first-principles computations surface states topological transport

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@article{arxiv.1205.3467,
  title  = {An isolated Dirac cone on the surface of ternary tetradymite-like topological insulators},
  author = {H. Lin and Tanmoy Das and L. A. Wray and S. -Y. Xu and M. Z. Hasan and A. Bansil},
  journal= {arXiv preprint arXiv:1205.3467},
  year   = {2012}
}

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4 pages, 3 figures

An isolated Dirac cone on the surface of ternary tetradymite-like topological insulators

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