Large Photoluminescence Enhancement by an Out-of-Plane Magnetic Field in Exfoliated WS$_2$ Flakes

doi:10.1088/0256-307X/37/8/087801

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Abstract：We report an out-of-plane magnetic field induced large photoluminescence enhancement in WS$_2$ flakes at $4$ K, in contrast to the photoluminescence enhancement provided by an in-plane field in general. Two mechanisms for the enhancement are proposed. One is a larger overlap of the electron and hole caused by the magnetic field induced confinement. The other is that the energy difference between $\varLambda$ and $K$ valleys is reduced by magnetic field, and thus enhancing the corresponding indirect-transition trions. Meanwhile, the Landé $g$ factor of the trion is measured to be $-0.8$, whose absolute value is much smaller than normal exciton, which is around $|-4|$. A model for the trion $g$ factor is presented, confirming that the smaller absolute value of the Landé $g$ factor is a behavior of this $\varLambda$–$K$ trion. By extending the valley space, we believe this work provides a further understanding of the valleytronics in monolayer transition metal dichalcogenides.

收稿日期: 2020-05-03 出版日期: 2020-07-28

:	78.67.-n	(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
	78.55.-m	(Photoluminescence, properties and materials)

引用本文:

. [J]. 中国物理快报, 2020, 37(8): 87801-.
Sibai Sun, Jianchen Dang, Xin Xie, Yang Yu, Longlong Yang, Shan Xiao, Shiyao Wu, Kai Peng, Feilong Song, Yunuan Wang, Jingnan Yang, Chenjiang Qian, Zhanchun Zuo, and Xiulai Xu. Large Photoluminescence Enhancement by an Out-of-Plane Magnetic Field in Exfoliated WS$_2$ Flakes. Chin. Phys. Lett., 2020, 37(8): 87801-.

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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/37/8/087801 或 https://cpl.iphy.ac.cn/CN/Y2020/V37/I8/87801

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