Power-law decay of standing waves on the surface of topological insulators

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	Power-law decay of standing waves on the surface of topological insulators
	Wang, J ; Li, W ; Cheng, P ; Song, CL ; Zhang, T ; Deng, P ; Chen, X ; Ma, XC ; He, K ; Jia, JF ; Xue, QK ; Zhu, BF
刊名	PHYSICAL REVIEW B
	2011
卷号	84 期号:23
关键词	SINGLE DIRAC CONE BI2TE3 BI2SE3 STATES LIMIT
ISSN号	1098-0121
通讯作者	Wang, J (reprint author), Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China.
中文摘要	We propose a general theory on the standing waves (quasiparticle interference pattern) caused by the scattering of surface states off step edges in topological insulators in which the extremal points on the constant energy contour of surface band play a dominant role. Experimentally, we image the interference patterns on both Bi2Te3 and Bi2Se3 films by measuring the local density of states with a scanning tunneling microscope. The observed decay indices of the standing waves agree excellently with the theoretical prediction: In Bi2Se3, only a single decay index of -3/2 exists, while in Bi2Te3 with strongly warped surface band, it varies from -3/2 to -1/2 and finally to -1 as the energy increases. The -1/2 decay indicates that the suppression of backscattering due to time-reversal symmetry does not necessarily lead to a spatial decay rate faster than that in the conventional two-dimensional electron system. Our formalism can also better explain the characteristic scattering wave vectors of the standing wave caused by nonmagnetic impurities on Bi2Te3.
收录类别	SCI
资助信息	NSFC [11074143]; Program of Basic Research Development of China [2011CB921901]
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/311004/51204]
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	Wang, J,Li, W,Cheng, P,et al. Power-law decay of standing waves on the surface of topological insulators[J]. PHYSICAL REVIEW B,2011,84(23).
APA	Wang, J.,Li, W.,Cheng, P.,Song, CL.,Zhang, T.,...&Zhu, BF.(2011).Power-law decay of standing waves on the surface of topological insulators.PHYSICAL REVIEW B,84(23).
MLA	Wang, J,et al."Power-law decay of standing waves on the surface of topological insulators".PHYSICAL REVIEW B 84.23(2011).