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A topological crystalline insulator (TCI) phase via topological phase transition and crystalline mirror symmetry

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arxiv 1210.2917 v1 pith:T3UMWKBZ submitted 2012-10-10 cond-mat.mes-hall

Su-Yang Xu , Chang Liu , Nasser Alidoust , M Neupane , D. Qian , I. Belopolski , J. D. Denlinger , Y. J. Wang
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H. Lin L. A. Wray G. Landolt B. Slomski J. H. Dil A. Marcinkova E. Morosan Q. Gibson R. Sankar F. C. Chou R. J. Cava A. Bansil M. Z. Hasan
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keywords topologicalphasebandbi-sbcrystallineinsulatorinversionmirror
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A Z2 topological insulator protected by time-reversal symmetry is realized via spin-orbit interaction driven band inversion. For example, the topological phase in the Bi-Sb system is due to an odd number of band inversions. A related spin-orbit system, the (Pb/Sn)Te class, has been known to contain an even number of inversions based on band theory. Here we experimentally investigate the possibility of a mirror symmetry protected topological crystalline insulator phase in the (Pb/Sn)Te class of materials which has been theoretically predicted to exist in its non-alloyed version. Our experimental results show that at a finite-Pb composition above the topological inversion phase transition, the surface exhibits even number of spin-polarized Dirac cone states (as opposed to odd as observed in Bi-Sb alloy or Bi2Se3) revealing mirror protected topological order distinct from that observed in Bi-Sb or Bi2Se3. Our observation of the spin-polarized Dirac surface states in the inverted (Pb/Sn)Te and their absence in the non-inverted compounds related via a topological phase transition (spin-orbit induced band inversion type) provide the experimental groundwork for opening the research on novel topological order in future quantum devices.

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  1. One-dimensional Dirac modes in the core of a pentagonal topological crystalline insulator nanowire

    cond-mat.mes-hall 2026-08 conditional novelty 7.0 of 10

    Pentagonal SnTe-class nanowires with cationic twin planes are predicted to host two spatially separated helical Dirac modes, one at the core and one at the outer surface.

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