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Spin polarization and transport of surface states in the topological insulators Bi2Se3 and Bi2Te3 from first
Oleg V Yazyev1, Joel E Moore, Steven G Louie
1Department of Physics, University of California, Berkeley, California 94720, USA.
Abstract:
We investigate the band dispersion and the spin texture of topologically protected surface states in the bulk topological insulators Bi2Se3 and Bi2Te3 by first-principles methods. Strong spin-orbit entanglement in these materials reduces the spin polarization of the surface states to ∼50% in both cases; this reduction is absent in simple models but of important implications to essentially any spintronic application. We propose a way of controlling the magnitude of spin polarization associated with a charge current in thin films of topological insulators by means of an external electric field. The proposed dual-gate device configuration provides new possibilities for electrical control of spin.
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