In-plane noncollinear exchange coupling mediated by helical edge states in quantum spin Hall systems

被引：28
|
作者：
Gao, Jinhua [1 ,4 ]
Chen, Weiqiang [1 ,4 ]
Xie, X. C. [2 ,3 ,5 ]
Zhang, Fu-chun [1 ,4 ]
机构：
[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[3] Oklahoma State Univ, Dept Phys, Stillwater, OK 74078 USA
[4] Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China
[5] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 24期
关键词：
Fermi level; ground states; quantum Hall effect; RKKY interaction; spin Hall effect; WELLS;
D O I：
10.1103/PhysRevB.80.241302
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study the Ruderman-Kittel-Kasuya-Yoshida interaction mediated by helical edge states in quantum spin Hall system. The helical edge states induce an in-plane noncollinear exchange coupling between two local spins, in contrast to the isotropic coupling induced in normal metal. The angle between the two local spins in the ground state depends on the Fermi level. This property may be used to control the angle of spins by tuning the electric gate.
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页数：4
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