Spin injection into a metal from a topological insulator

Details Spin injection into a metal from a topological insulator Spin injection into a metal from a topological insulator

2012-03-19

arxiv.org/abs/1203.4266v2

Physics

Condensed Matter

Strongly Correlated Electrons

Revised version; Minor changes from v1

Scientific paper

We study a junction of a topological insulator with a thin two-dimensional (2D) metallic or partially polarized ferromagnetic film deposited on a 3D insulator. We show that such a junction leads to a finite spin current injection into the metal/ferromagnet whose amplitude and direction can both be controlled by a voltage applied across the junction. We also study the dependence of the spin current on a barrier potential $V_0$ at the junction, show that it displays an oscillatory behavior with a decaying envelope as a function of $V_0$, and point out the role of the chiral spin-momentum locking of the Dirac electrons behind this phenomenon. We suggest experiments to test our theory.

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