Journal
PHYSICAL REVIEW B
Volume 87, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.235317
Keywords
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Funding
- Division of Materials Science and Engineering, Basic Energy Sciences, US Department of Energy [DE-FG02-07ER46352, DE-FG-02-05ER46200, AC02-05CH11231]
- Advanced Light Source, Berkeley
- NSC in Taiwan [100-2112-M-110-001-MY2]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006492] Funding Source: National Science Foundation
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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 Z(2) 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.
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