中国物理B ›› 2022, Vol. 31 ›› Issue (5): 57803-057803.doi: 10.1088/1674-1056/ac380c

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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. 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
  • 收稿日期:2021-06-23 修回日期:2021-11-05 发布日期:2022-04-09
  • 通讯作者: Xiu-Juan Zhuang,E-mail:zhuangxj@hnu.edu.cn E-mail:zhuangxj@hnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.61635001,52072117,and 51972105).

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. 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
  • Received:2021-06-23 Revised:2021-11-05 Published:2022-04-09
  • Contact: Xiu-Juan Zhuang,E-mail:zhuangxj@hnu.edu.cn E-mail:zhuangxj@hnu.edu.cn
  • About author:2021-11-10
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.61635001,52072117,and 51972105).

摘要: 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.

关键词: transition metal dichalcogenides, photoluminescence, localized exciton, exciton density

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.

Key words: transition metal dichalcogenides, photoluminescence, localized exciton, exciton density

中图分类号:  (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

  • 78.67.-n
78.55.-m (Photoluminescence, properties and materials) 52.70.Kz (Optical (ultraviolet, visible, infrared) measurements)