| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Large Photoluminescence Enhancement by an Out-of-Plane Magnetic Field in Exfoliated WS$_2$ Flakes |
| Sibai Sun1,2, Jianchen Dang1,2, Xin Xie1,2, Yang Yu1,2, Longlong Yang1,2, Shan Xiao1,2, Shiyao Wu1,2, Kai Peng1,2, Feilong Song1,2, Yunuan Wang1,3, Jingnan Yang1,2, Chenjiang Qian1,2, Zhanchun Zuo1,2, and Xiulai Xu1,2,4* |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3Key Laboratory of Luminescence and Optical Information (Ministry of Education), Beijing Jiaotong University, Beijing 100044, China
4Songshan Lake Materials Laboratory, Dongguan 523808, China
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| Cite this article: |
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Sibai Sun, Jianchen Dang, Xin Xie et al 2020 Chin. Phys. Lett. 37 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.
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Received: 03 May 2020
Published: 28 July 2020
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| PACS: |
78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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78.55.-m
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(Photoluminescence, properties and materials)
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| Fund: Supported by the National Natural Science Foundation of China (Grants Nos. 11934019, 61675228, 11721404, 51761145104 and 11874419), the Strategic Priority Research Program, the Instrument Developing Project and the Interdisciplinary Innovation Team of the Chinese Academy of Sciences (Grant Nos. XDB28000000 and YJKYYQ20180036), and the Key Research and Development Program of Guangdong Province (Grant No. 2018B030329001). |
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