Magnetoelectric response of the time-reversal invariant helical metal

被引：51
|
作者：
Garate, Ion [1 ,2 ]
Franz, M. [1 ]
机构：
[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[2] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 17期
基金：
加拿大自然科学与工程研究理事会;
关键词：
WEAK FERROMAGNETISM;
D O I：
10.1103/PhysRevB.81.172408
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We derive compact analytical expressions for the coupled spin-charge susceptibility of a clean helical metal at the surface of a three-dimensional topological insulator (TI). These expressions lead to unconventional noncollinear Ruderman-Kittel-Kasuya-Yoshida interactions between two impurity magnetic moments placed on the surface of a TI and predict the generation of electric currents by time-dependent magnetic moments. We determine the influence of gate and bias voltages on the interlayer exchange coupling between two singledomain ferromagnetic monolayers deposited on top of a TI.
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页数：4
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