Topological superconductivity at the edge of transition-metal dichalcogenides

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	Topological superconductivity at the edge of transition-metal dichalcogenides
	Xu, G ; Wang, J ; Yan, BH ; Qi, XL
刊名	PHYSICAL REVIEW B
	2014
卷号	90 期号:10
ISSN号	1098-0121
通讯作者	Xu, G (reprint author), Stanford Univ, Dept Phys, McCullough Bldg, Stanford, CA 94305 USA.
中文摘要	Time-reversal breaking topological superconductors are new states of matter which can support Majorana zero modes at the edge. In this Rapid Communication, we propose a different realization of one-dimensional topological superconductivity and Majorana zero modes. The proposed system consists of a monolayer of transition-metal dichalcogenides M X-2 (M = Mo, W; X = S, Se) on top of a superconducting substrate. Based on first-principles calculations, we show that a zigzag edge of the monolayer M X-2 terminated by a metal atom M has edge states with strong spin-orbit coupling and spontaneous magnetization. By proximity coupling with a superconducting substrate, topological superconductivity can be induced at such an edge. We propose NbS2 as a natural choice of substrate, and estimate the proximity induced superconducting gap based on first-principles calculation and a low energy effective model. As an experimental consequence of our theory, we predict that Majorana zero modes can be detected at the 120 degrees corner of a M X-2 flake in proximity to a superconducting substrate.
资助信息	Defense Advanced Research Projects Agency Microsystems Technology Office, MesoDynamic Architecture Program (MESO) [N66001-11-1-4105]; US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]; European Research Council [ERC 291472]; NSF of China
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59508]
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	Xu, G,Wang, J,Yan, BH,et al. Topological superconductivity at the edge of transition-metal dichalcogenides[J]. PHYSICAL REVIEW B,2014,90(10).
APA	Xu, G,Wang, J,Yan, BH,&Qi, XL.(2014).Topological superconductivity at the edge of transition-metal dichalcogenides.PHYSICAL REVIEW B,90(10).
MLA	Xu, G,et al."Topological superconductivity at the edge of transition-metal dichalcogenides".PHYSICAL REVIEW B 90.10(2014).