Effect of strain on exciton dynamics in monolayer WS2

doi:10.1088/1674-1056/28/8/087201

Abstract The exciton dynamics in a WS₂ monolayer with strain are studied by transient absorption measurements. We measure the differential transmission signal from monolayer WS₂ as a function of the probe wavelength at different levels of strain applied to the sample. The differential transmission spectrum has a positive maximum value at about 614 nm and shows no significant strain dependence. By time-resolving the differential transmission signal, we find that the strain has a minimal effect on the exciton formation process. However, the exciton lifetime is significantly reduced by strain. These results provide useful information for applications of WS₂ in flexible electronic and optoelectronic devices where strain is inevitable.

Keywords: transient absorption transition metal dichalcogenides excitons strain

Received: 08 April 2019
Revised: 19 May 2019
Accepted manuscript online:

PACS:	72.80.Ga	(Transition-metal compounds)
	78.20.-e	(Optical properties of bulk materials and thin films)
	78.47.jb	(Transient absorption)
	78.47.jg	(Time resolved reflection spectroscopy)

Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0202302), the National Natural Science Foundation of China (Grant Nos. 61527817 and 61875236), the Initiative Postdocs Supporting Program of China (Grant No. BX201600013), the General Financial Grant from the China Postdoctoral Science Foundation (Grant No. 2017M610756), the Overseas Expertise Introduction Center for Discipline Innovation, China, and the 111 Center of China.

Corresponding Authors: Jia-Qi He, Yong-Sheng Wang
E-mail: jqhe@bjtu.edu.cn;yshwang@bjtu.edu.cn

Cite this article:

Lu Zhang(张璐), Da-Wei He(何大伟), Jia-Qi He(何家琪), Yang Fu(付洋), Yong-Sheng Wang(王永生) Effect of strain on exciton dynamics in monolayer WS₂ 2019 Chin. Phys. B 28 087201

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Effect of strain on exciton dynamics in monolayer WS₂