Mirror-symmetry protected non-TRIM surface state in the weak topological insulator Bi2TeI.

@article{Rusinov2016MirrorsymmetryPN,
  title={Mirror-symmetry protected non-TRIM surface state in the weak topological insulator Bi2TeI.},
  author={I P Rusinov and Tatiana V. Menshchikova and Anna Isaeva and Sergey V Eremeev and Yu M Koroteev and Maia Garc{\'i}a Vergniory and Pedro M. Echenique and Evgueni V. Chulkov},
  journal={Scientific reports},
  year={2016},
  volume={6},
  pages={
          20734
        }
}
Strong topological insulators (TIs) support topological surfaces states on any crystal surface. In contrast, a weak, time-reversal-symmetry-driven TI with at least one non-zero v1, v2, v3 ℤ2 index should host spin-locked topological surface states on the surfaces that are not parallel to the crystal plane with Miller indices (v1 v2 v3). On the other hand, mirror symmetry can protect an even number of topological states on the surfaces that are perpendicular to a mirror plane. Various symmetries… CONTINUE READING

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