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The topological-crystalline-insulator (Pb,Sn)Te - surface states and their spin-polarization

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arxiv 1303.7119 v1 pith:KAKW7LK3 submitted 2013-03-28 cond-mat.mtrl-sci

S. Safaei , P. Kacman , R. Buczko This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords surfacestatespointsprotectionstudiedtopological-crystalline-insulatorapartappear
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Using a tight-binding approach we study theoretically the nature of surface states in Pb0.4Sn0.6Te - the newly discovered topological-crystalline-insulator. Apart from the studied before (001) surface states, two other surface families, {011} and {111}, in which the mirror symmetry of the crystal's rock-salt structure plays the same role in topological protection, are considered. Our calculations show that while in (111) surface states of (Pb,Sn)Te four single topologically protected Dirac-cones should appear, for the (110) surface states the protection is lifted for two L points. In this case, instead of the Dirac points energy gaps occur in the surface states, due to the interaction between the two L valleys. In all studied cases a chiral spin texture is obtained.

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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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