Spin-charge locking and tunneling into a helical metal

被引：41
|
作者：
Schwab, P. [1 ]
Raimondi, R. [2 ,3 ]
Gorini, C. [4 ,5 ]
机构：
[1] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany
[2] Univ Roma Tre, CNISM, I-00146 Rome, Italy
[3] Univ Roma Tre, Dipartimento Fis E Amaldi, I-00146 Rome, Italy
[4] CNRS, Inst Phys & Chim Mat Strasbourg, UMR 7504, F-67034 Strasbourg 2, France
[5] Univ Strasbourg, F-67034 Strasbourg 2, France
来源：
EPL | 2011年 / 93卷 / 06期
关键词：
TOPOLOGICAL-INSULATOR; TRANSPORT; HALL;
D O I：
10.1209/0295-5075/93/67004
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 metal 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. Copyright (C) EPLA, 2011
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页数：5
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