Tuning the vertical location of helical surface states in topological insulator heterostructures via dual-proximity effects

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	Tuning the vertical location of helical surface states in topological insulator heterostructures via dual-proximity effects
	G. F. Wu; H. Chen; Y. Sun; X. G. Li; P. Cui; C. Franchini; J. L. Wang; X. Q. Chen; Z. Y. Zhang
	2013
发表期刊	Scientific Reports
ISSN	2045-2322
卷号	3
摘要	In integrating topological insulators (TIs) with conventional materials, one crucial issue is how the topological surface states (TSS) will behave in such heterostructures. We use first-principles approaches to establish accurate tunability of the vertical location of the TSS via intriguing dual-proximity effects. By depositing a conventional insulator (CI) overlayer onto a TI substrate (Bi2Se3 or Bi2Te3), we demonstrate that, the TSS can float to the top of the CI film, or stay put at the CI/TI interface, or be pushed down deeper into the otherwise structurally homogeneous TI substrate. These contrasting behaviors imply a rich variety of possible quantum phase transitions in the hybrid systems, dictated by key material-specific properties of the CI. These discoveries lay the foundation for accurate manipulation of the real space properties of TSS in TI heterostructures of diverse technological significance.
部门归属	[wu, guangfen ; li, xiaoguang ; cui, ping ; zhang, zhenyu] univ sci & technol china, hefei natl lab phys sci microscale, icqd, hefei 230026, anhui, peoples r china. [wu, guangfen ; wang, jinlan] southeast univ, dept phys, nanjing 211189, jiangsu, peoples r china. [chen, hua ; li, xiaoguang ; cui, ping] univ tennessee, dept phys, knoxville, tn 37996 usa. [chen, hua ; zhang, zhenyu] univ texas austin, dept phys, austin, tx 78712 usa. [sun, yan ; franchini, cesare ; chen, xing-qiu] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [li, xiaoguang] fudan univ, state key lab surface phys, shanghai 200433, peoples r china. [li, xiaoguang] fudan univ, dept phys, shanghai 200433, peoples r china. [zhang, zhenyu] harvard univ, sch appl sci & engn, cambridge, ma 02138 usa. ; chen, xq (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; jlwang@seu.edu.cn ; xingqiu.chen@imr.ac.cn
关键词	Single Dirac Cone Phase-transition Bi2se3 Bi2te3 Sb2te3 Order
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71581
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. F. Wu,H. Chen,Y. Sun,et al. Tuning the vertical location of helical surface states in topological insulator heterostructures via dual-proximity effects[J]. Scientific Reports,2013,3.
APA	G. F. Wu.,H. Chen.,Y. Sun.,X. G. Li.,P. Cui.,...&Z. Y. Zhang.(2013).Tuning the vertical location of helical surface states in topological insulator heterostructures via dual-proximity effects.Scientific Reports,3.
MLA	G. F. Wu,et al."Tuning the vertical location of helical surface states in topological insulator heterostructures via dual-proximity effects".Scientific Reports 3(2013).