Finite Size Effects on Helical Edge States in a Quantum Spin-Hall System

被引：427

作者：

Zhou, Bin ^{[1
,2
,3
]}

Lu, Hai-Zhou ^{[1
,2
]}

Chu, Rui-Lin ^{[1
,2
]}

Shen, Shun-Qing ^{[1
,2
]}

Niu, Qian ^{[4
]}

机构：

[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

[2] Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China

[3] Hubei Univ, Dept Phys, Wuhan 430062, Peoples R China

[4] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.101.246807

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The hallmark of the spin-Hall insulator is the presence of gapless edge states of different spins moving in opposite directions. Through analytical solutions in a model calculation for a strip of finite width, we find that edge states on the two sides can couple together to produce a gap in the spectrum, destroying the quantum spin-Hall effect. The application of a magnetic field can however modify and even remove the gap by shifting the momenta of the edge states relative to each other.

引用

页数：4

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