Valley-selective circular dichroism of monolayer molybdenum disulphide

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	Valley-selective circular dichroism of monolayer molybdenum disulphide
	Cao, T ; Wang, G ; Han, WP ; Ye, HQ ; Zhu, CR ; Shi, JR ; Niu, Q ; Tan, PH ; Wang, E ; Liu, BL ; Feng, J
刊名	NATURE COMMUNICATIONS
	2012
卷号	3
关键词	GRAPHENE MOS2
ISSN号	2041-1723
通讯作者	Feng, J (reprint author), Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China.
中文摘要	A two-dimensional honeycomb lattice harbours a pair of inequivalent valleys in the k-space electronic structure, in the vicinities of the vertices of a hexagonal Brillouin zone, K-+/-. It is particularly appealing to exploit this emergent degree of freedom of charge carriers, in what is termed 'valleytronics'. The physics of valleys mimics that of spin, and will make possible devices, analogous to spintronics, such as valley filter and valve, and optoelectronic Hall devices, all very promising for next-generation electronics. The key challenge lies with achieving valley polarization, of which a convincing demonstration in a two-dimensional honeycomb structure remains evasive. Here we show, using first principles calculations, that monolayer molybdenum disulphide is an ideal material for valleytronics, for which valley polarization is achievable via valley-selective circular dichroism arising from its unique symmetry. We also provide experimental evidence by measuring the circularly polarized photoluminescence on monolayer molybdenum disulphide, which shows up to 50% polarization.
收录类别	SCI
资助信息	National Science Foundation of China (NSFC) [11174009, 10974238, 91021007, 11174338, 10934007, 10911130356, 10874177]; National Basic Research Program of China (973 Program) [2009CB929301, 2009CB930500, 2011CBA00109, 2012CB921300]; Welch Foundation [F-1255]; DOE-DMSE [DE-FG03-02ER45958]
语种	英语
公开日期	2013-09-23
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/46492]
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	Cao, T,Wang, G,Han, WP,et al. Valley-selective circular dichroism of monolayer molybdenum disulphide[J]. NATURE COMMUNICATIONS,2012,3.
APA	Cao, T.,Wang, G.,Han, WP.,Ye, HQ.,Zhu, CR.,...&Feng, J.(2012).Valley-selective circular dichroism of monolayer molybdenum disulphide.NATURE COMMUNICATIONS,3.
MLA	Cao, T,et al."Valley-selective circular dichroism of monolayer molybdenum disulphide".NATURE COMMUNICATIONS 3(2012).