Spin injection into a metal from a topological insulator

S. Modak, K. Sengupta, Diptiman Sen
2012 Physical Review B  
We study a junction of a topological insulator with a thin two-dimensional (2D) non-magnetic or partially polarized ferromagnetic metallic film deposited on a 3D insulator. We show that such a junction leads to 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
more » ... 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.
doi:10.1103/physrevb.86.205114 fatcat:tweejcvr2jhfjn6mpr37sf6sce