de Leeuw, Bart, Kuppersbusch, Carolin, Juricic, Vladimir ORCID: 0000-0002-3000-5393 and Fritz, Lars (2015). Stability of the X-Y phase of the two-dimensional C-4 point group insulator. Phys. Rev. B, 91 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Noninteracting insulating electronic states of matter can be classified according to their symmetries in terms of topological invariants which can be related to effective surface theories. These effective surface theories are in turn topologically protected against the effects of disorder. Topological crystalline insulators are, on the other hand, trivial in the sense of the above classification but still possess surface modes. In this paper we consider an extension of the Bernevig-Hughes-Zhang model that describes a point group insulator. We explicitly show that the surface properties of this state can be as robust as in topologically nontrivial insulators but only if the S-z component of the spin is conserved. However, in the presence of Rashba spin-orbit coupling this protection vanishes, and the surface states localize, even if the crystalline symmetries are intact on average.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
de Leeuw, BartUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuppersbusch, CarolinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Juricic, VladimirUNSPECIFIEDorcid.org/0000-0002-3000-5393UNSPECIFIED
Fritz, LarsUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-401032
DOI: 10.1103/PhysRevB.91.235430
Journal or Publication Title: Phys. Rev. B
Volume: 91
Number: 23
Date: 2015
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
TOPOLOGICAL CRYSTALLINE INSULATOR; SINGLE DIRAC CONE; EXPERIMENTAL REALIZATION; TRANSITIONMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/40103

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