TY  - SER
AU  - Munoz,F.
AU  - Rauch,T.
AU  - Henk,Jurgen
AU  - Chulkov,Evgueni V.
AU  - Mertig,I.
AU  - Botti,S.
AU  - Marques,M.A.L.
AU  - Romero,A.H.
AU  - Vergniory,M.G.
TI  - Topological crystalline insulator in a new bi semiconducting phase
KW  - топологические изоляторы
KW  - электронные устройства
KW  - статьи в журналах
N1  - Библиогр.: 49 назв
N2  - 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 nM = −2, but not a 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
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000576654
ER  -