Spin injection into a metal from a topological insulator

Modak, S. ; Sengupta, K. ; Sen, Diptiman (2012) Spin injection into a metal from a topological insulator Physical Review B: Condensed Matter and Materials Physics, 86 (20). 205114_1-205114_6. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v86/i20/e205114

Related URL: http://dx.doi.org/10.1103/PhysRevB.86.205114

Abstract

We study a junction of a topological insulator with a thin two-dimensional nonmagnetic or partially polarized ferromagnetic metallic film deposited on a three-dimensional insulator. We show, by deriving generic boundary conditions applicable to electrons traversing the junction, that there is a finite spin-current injection into the film whose magnitude can be controlled by tuning a voltage V applied across the junction. For ferromagnetic films, the direction of the component of the spin current along the film magnetization can also be tuned by tuning the barrier potential V0 at the junction. We point out the role of the chiral spin-momentum locking of the Dirac electrons behind this phenomenon and suggest experiments to test our theory.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:95734
Deposited On:21 Nov 2012 09:16
Last Modified:21 Nov 2012 09:16

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