Spin Chern numbers and time-reversal-symmetry-broken quantum spin Hall effect

doi:10.1088/1674-1056/22/6/067201

Abstract The quantum spin Hall (QSH) effect is considered to be unstable to perturbations violating the time-reversal (TR) symmetry. We review some recent developments in the search of the QSH effect in the absence of the TR symmetry. The possibility to realize a robust QSH effect by artificial removal of the TR symmetry of the edge states is explored. As a useful tool to characterize topological phases without the TR symmetry, the spin-Chern number theory is introduced.

Keywords: spin-polarized transport quantum spin Hall effect surface state edge state topological insulator

Received: 17 April 2013
Accepted manuscript online:

PACS:	72.25.-b	(Spin polarized transport)
	73.43.-f	(Quantum Hall effects)
	73.20.At	(Surface states, band structure, electron density of states)
	73.50.-h	(Electronic transport phenomena in thin films)

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2009CB929504, 2011CB922103, and 2010CB923400), the National Natural Science Foundation of China (Grant Nos. 11225420, 11074110, 11174125, 11074109, and 91021003), the Priority Academic Program Development of Jiangsu Higher Education Institutions, China, the US NSF (Grant Nos. DMR-0906816 and DMR-1205734), and Princeton MRSEC (Grant No. DMR-0819860).

Corresponding Authors: Sheng Dong-Ning, Xing Ding-Yu
E-mail: shengli@nju.edu.cn; dyxing@nju.edu.cn

Cite this article:

Sheng Li (盛利), Li Hui-Chao (李会超), Yang Yun-You (杨运友), Sheng Dong-Ning (盛冬宁), Xing Ding-Yu (邢定钰) Spin Chern numbers and time-reversal-symmetry-broken quantum spin Hall effect 2013 Chin. Phys. B 22 067201

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