Spin-Charge Locking and Tunneling into a Helical Metal

Details Spin-Charge Locking and Tunneling into a Helical Metal Spin-Charge Locking and Tunneling into a Helical Metal

2011-01-30

arxiv.org/abs/1101.5802v1

EPL 93, 67004 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 1 figure

Scientific paper

10.1209/0295-5075/93/67004

We derive a kinetic equation for the electrons moving on the surface of a three-dimensional topological insulator. Due to the helical nature of the excitations backward scattering is suppressed in the collision integral, and the spin dynamics is entirely constrained by that of the charge. We further analyze the tunneling between the helical and a conventional metal or ferromagnet. We find that the tunnel resistance strongly depends on the angle between the magnetization in the ferromagnet and the current in the helical metal. A nonmagnetic layer on top of the helical metal amplifies the current-induced spin polarization.

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