Stabilization of the Quantum Spin Hall Effect by Designed Removal of Time-Reversal Symmetry of Edge States

被引：44
|
作者：
Li, Huichao [1 ,2 ]
Sheng, L. [1 ,2 ]
Shen, R. [1 ,2 ]
Shao, L. B. [1 ,2 ]
Wang, Baigeng [1 ,2 ]
Sheng, D. N. [3 ]
Xing, D. Y. [1 ,2 ,4 ]
机构：
[1] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[3] Calif State Univ Northridge, Dept Phys & Astron, Northridge, CA 91330 USA
[4] Nanjing Univ, Natl Ctr Microstruct & Quantum Manipulat, Nanjing 210093, Jiangsu, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 26期
基金：
中国国家自然科学基金; 美国国家科学基金会;
关键词：
SINGLE DIRAC CONE; TOPOLOGICAL-INSULATOR; REALIZATION;
D O I：
10.1103/PhysRevLett.110.266802
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The quantum spin Hall (QSH) effect is known to be unstable to perturbations violating time-reversal symmetry. We show that creating a narrow ferromagnetic region near the edge of a QSH sample can push one of the counterpropagating edge states to the inner boundary of the ferromagnetic region and leave the other at the outer boundary, without changing their spin polarizations and propagation directions. Since the two edge states are spatially separated into different "lanes," the QSH effect becomes robust against symmetry-breaking perturbations.
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页数：5
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