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Journal articles
Topological Crystalline Insulator in a New Bi Semiconducting Phase
Abstract : Topological 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 n M = −2, but not a Z 2 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.
https://hal-univ-lyon1.archives-ouvertes.fr/hal-02290196
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Submitted on : Thursday, February 4, 2021 - 10:37:11 AM
Last modification on : Monday, November 29, 2021 - 3:39:02 PM
Long-term archiving on: : Wednesday, May 5, 2021 - 6:18:45 PM
Contributor : Depot 3 Lyon 1 Connect in order to contact the contributor
Submitted on : Thursday, February 4, 2021 - 10:37:11 AM
Last modification on : Monday, November 29, 2021 - 3:39:02 PM
Long-term archiving on: : Wednesday, May 5, 2021 - 6:18:45 PM
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srep21790.pdf
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Distributed under a Creative Commons Attribution 4.0 International License