Anomalous enhancement of valley polarization in multilayer WS2 at room temperature.

	Anomalous enhancement of valley polarization in multilayer WS2 at room temperature.
	Su, Huimin; Wei, Chengrong; Deng, Aiying; Deng, Dongmei; Yang, Chunlei; Dai, Jun-Feng
刊名	NANOSCALE
	2017
文献子类	期刊论文
英文摘要	We probe the polarization of the "A" exciton photoluminescence from monolayer and multilayer WS2 at 10 K and 295 K under near-resonant and off-resonant conditions. The monolayer WS2 exhibits relatively low valley polarization, around 24% at 10 K and 8% at 295 K, while all multilayer WS2 samples show very high valley polarization, which is a more or less constant value of around 80% at 10 K under near-resonant excitation. At room temperature, it is observed experimentally that valley polarization in multilayer WS2 monotonously increases with shrinking of the indirect bandgap energy. The phonon-assisted intervalley scattering via the K-G-K(K') valleys is identified as the primary valley polarization relaxation channel, which could be gradually suppressed as the thickness increases, leading to a valley polarization of up to 70% in multilayer WS2 (>3 unit layers).
URL标识	查看原文
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/11606]
专题	深圳先进技术研究院_集成所
作者单位	NANOSCALE
推荐引用方式 GB/T 7714	Su, Huimin,Wei, Chengrong,Deng, Aiying,et al. Anomalous enhancement of valley polarization in multilayer WS2 at room temperature.[J]. NANOSCALE,2017.
APA	Su, Huimin,Wei, Chengrong,Deng, Aiying,Deng, Dongmei,Yang, Chunlei,&Dai, Jun-Feng.(2017).Anomalous enhancement of valley polarization in multilayer WS2 at room temperature..NANOSCALE.
MLA	Su, Huimin,et al."Anomalous enhancement of valley polarization in multilayer WS2 at room temperature.".NANOSCALE (2017).