Spatial distribution of spin polarization in a channel on the surface of a topological insulator

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	Spatial distribution of spin polarization in a channel on the surface of a topological insulator
	X. Y. Zhou; H. H. Shao; Y. M. Liu; D. S. Tang; G. H. Zhou
	2012
发表期刊	Journal of Physics-Condensed Matter
ISSN	0953-8984
卷号	24 期号:18
摘要	We study the spatial distribution of electron spin polarization for a gate-controlled T-shaped channel on the surface of a three-dimensional topological insulator (3D TI). We demonstrate that an energy gap depending on channel geometry parameters is definitely opened due to the spatial confinement. Spin surface locking in momentum space for a uniform wide channel with Hamiltonian linearity in the wavevector is still kept, but it is broken with Hamiltonian nonlinearity in the wavevector, like that for two-dimensional surface states widely studied in the literature. However, the spin surface locking for a T-shaped channel is broken even with Hamiltonian linearity in the wavevector. Interestingly, the magnitude and direction of the in-plane spin polarization are spatially dependent in all regions due to the breaking of translational symmetry of the T-shaped channel system. These interesting findings for an electrically controlled nanostructure based on the 3D TI surface may be testable with the present experimental technique, and may provide further understanding the nature of 3D TI surface states.
部门归属	[zhou, xiaoying; shao, huaihua; liu, yiman; tang, dongsheng; zhou, guanghui] hunan normal univ, minist educ, dept phys, changsha 410081, hunan, peoples r china. [zhou, xiaoying; shao, huaihua; liu, yiman; tang, dongsheng; zhou, guanghui] hunan normal univ, minist educ, key lab low dimens quantum struct & manipulat, changsha 410081, hunan, peoples r china. [zhou, guanghui] chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china.;zhou, xy (reprint author), hunan normal univ, minist educ, dept phys, changsha 410081, hunan, peoples r china.;ghzhou@hunnu.edu.cn
关键词	Hgte Quantum-wells Nanoribbons Bi2te3 State
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60531
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Y. Zhou,H. H. Shao,Y. M. Liu,et al. Spatial distribution of spin polarization in a channel on the surface of a topological insulator[J]. Journal of Physics-Condensed Matter,2012,24(18).
APA	X. Y. Zhou,H. H. Shao,Y. M. Liu,D. S. Tang,&G. H. Zhou.(2012).Spatial distribution of spin polarization in a channel on the surface of a topological insulator.Journal of Physics-Condensed Matter,24(18).
MLA	X. Y. Zhou,et al."Spatial distribution of spin polarization in a channel on the surface of a topological insulator".Journal of Physics-Condensed Matter 24.18(2012).