Nontrivial spin texture of the coaxial Dirac cones on the surface of topological crystalline insulator SnTe

Yung Jui Wang, Wei Feng Tsai, Hsin Lin, Su Yang Xu, M. Neupane, M. Z. Hasan, A. Bansil

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52 Scopus citations

Abstract

We present first-principles calculations of the nontrivial surface states and their spin textures in the topological crystalline insulator SnTe. The surface state dispersion on the [001] surface exhibits four Dirac cones centered along the intersection of the mirror plane and the surface plane. We propose a simple model of two interacting coaxial Dirac cones to describe both the surface state dispersion and the associated spin texture. The out-of-plane spin polarization is found to be zero due to the crystalline and time-reversal symmetries. The in-plane spin texture shows helicity with some distortion due to the interaction of the two coaxial Dirac cones, indicating a nontrivial mirror Chern number of -2, distinct from the value of -1 in a Z2 topological insulator such as Bi/Sb alloys or Bi2Se3. The surface state dispersion and its spin texture would provide an experimentally accessible signature for determining the nontrivial mirror Chern number.

Original languageEnglish (US)
Article number235317
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number23
DOIs
StatePublished - Jun 25 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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