Quantum Spin Hall Effect in Silicene and Two-Dimensional Germanium

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	Quantum Spin Hall Effect in Silicene and Two-Dimensional Germanium
	Liu, CC ; Feng, WX ; Yao, YG
刊名	PHYSICAL REVIEW LETTERS
	2011
卷号	107 期号:7
关键词	WELLS
ISSN号	0031-9007
通讯作者	Yao, YG (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	We investigate the spin-orbit opened energy gap and the band topology in recently synthesized silicene as well as two-dimensional low-buckled honeycomb structures of germanium using first-principles calculations. We demonstrate that silicene with topologically nontrivial electronic structures can realize the quantum spin Hall effect (QSHE) by exploiting adiabatic continuity and the direct calculation of the Z(2) topological invariant. We predict that the QSHE can be observed in an experimentally accessible low temperature regime in silicene with the spin-orbit band gap of 1.55 meV, much higher than that of graphene. Furthermore, we find that the gap will increase to 2.9 meV under certain pressure strain. Finally, we also study germanium with a similar low-buckled stable structure, and predict that spin-orbit coupling opens a band gap of 23.9 meV, much higher than the liquid nitrogen temperature.
收录类别	SCI
资助信息	NSF of China [10974231]; MOST of China [2007CB925000, 2011CBA00100]; Super-computing Center of Chinese Academy of Sciences
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/51741]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Liu, CC,Feng, WX,Yao, YG. Quantum Spin Hall Effect in Silicene and Two-Dimensional Germanium[J]. PHYSICAL REVIEW LETTERS,2011,107(7).
APA	Liu, CC,Feng, WX,&Yao, YG.(2011).Quantum Spin Hall Effect in Silicene and Two-Dimensional Germanium.PHYSICAL REVIEW LETTERS,107(7).
MLA	Liu, CC,et al."Quantum Spin Hall Effect in Silicene and Two-Dimensional Germanium".PHYSICAL REVIEW LETTERS 107.7(2011).