S. Modak, K. Sengupta, Diptiman Sen
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.
View original:
http://arxiv.org/abs/1203.4266
No comments:
Post a Comment