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Exciton luminescence and many-body effect of monolayer WS2 at room temperature |
| Jian-Min Wu(吴建民)1, Li-Hui Li(黎立辉)1, Wei-Hao Zheng(郑玮豪)2, Bi-Yuan Zheng(郑弼元)2, Zhe-Yuan Xu(徐哲元)2, Xue-Hong Zhang(张学红)2, Chen-Guang Zhu(朱晨光)2, Kun Wu(吴琨)1, Chi Zhang(张弛)1, Ying Jiang(蒋英)1, Xiao-Li Zhu(朱小莉)1, and Xiu-Juan Zhuang(庄秀娟)1,† |
1 Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronics, Hunan University, Changsha 410082, China;
2 College of Materials Science and Engineering, Hunan University, Changsha 410082, China |
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Abstract Monolayer transition metal dichalcogenides favor the formation of a variety of excitonic quasiparticles, and can serve as an ideal material for exploring room-temperature many-body effects in two-dimensional systems. Here, using mechanically exfoliated monolayer WS2 and photoluminescence (PL) spectroscopy, exciton emission peaks are confirmed through temperature-dependent and electric-field-tuned PL spectroscopy. The dependence of exciton concentration on the excitation power density at room temperature is quantitatively analyzed. Exciton concentrations covering four orders of magnitude are divided into three stages. Within the low carrier concentration stage, the system is dominated by excitons, with a small fraction of trions and localized excitons. At the high carrier concentration stage, the localized exciton emission from defects coincides with the emission peak position of trions, resulting in broad spectral characteristics at room temperature.
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Received: 23 June 2021
Revised: 05 November 2021
Accepted manuscript online:
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PACS:
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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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52.70.Kz
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(Optical (ultraviolet, visible, infrared) measurements)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.61635001,52072117,and 51972105). |
Corresponding Authors:
Xiu-Juan Zhuang,E-mail:zhuangxj@hnu.edu.cn
E-mail: zhuangxj@hnu.edu.cn
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| About author: 2021-11-10 |
Cite this article:
Jian-Min Wu(吴建民), Li-Hui Li(黎立辉), Wei-Hao Zheng(郑玮豪), Bi-Yuan Zheng(郑弼元), Zhe-Yuan Xu(徐哲元), Xue-Hong Zhang(张学红), Chen-Guang Zhu(朱晨光), Kun Wu(吴琨), Chi Zhang(张弛), Ying Jiang(蒋英),Xiao-Li Zhu(朱小莉), and Xiu-Juan Zhuang(庄秀娟) Exciton luminescence and many-body effect of monolayer WS2 at room temperature 2022 Chin. Phys. B 31 057803
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