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Title

Topological crystalline insulator in a new Bi semiconducting phase

AuthorsMunoz, F.; Vergniory, M.; Rauch, Tomáš; Henk, J.; Chulkov, Eugene V. ; Mertig, I.; Botti, Silvana; Marques, Miguel A. L.; Romero, A. H.
Issue Date2016
PublisherNature Publishing Group
CitationScientific Reports 6: 21790 (2016)
AbstractTopological crystalline insulators are a type of topological insulators whose topological surface states are protected by a crystal symmetry, thus the surface gap can be tuned by applying strain or an electric field. In this paper we predict by means of ab initio calculations a new phase of Bi which is a topological crystalline insulator characterized by a mirror Chern number nM = −2, but not a Z2 strong topological insulator. This system presents an exceptional property: at the (001) surface its Dirac cones are pinned at the surface high-symmetry points. As a consequence they are also protected by time-reversal symmetry and can survive against weak disorder even if in-plane mirror symmetry is broken at the surface. Taking advantage of this dual protection, we present a strategy to tune the band-gap based on a topological phase transition unique to this system. Since the spin-texture of these topological surface states reduces the back-scattering in carrier transport, this effective band-engineering is expected to be suitable for electronic and optoelectronic devices with reduced dissipation.
DescriptionThis work is licensed under a Creative Commons Attribution 4.0 International License.
Publisher version (URL)http://dx.doi.org/10.1038/srep21790
URIhttp://hdl.handle.net/10261/136840
DOI10.1038/srep21790
Identifiersdoi: 10.1038/srep21790
issn: 2045-2322
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