Efficient Optical Modulation of Exciton State Population in Monolayer MoS<sub>2</sub> at Room Temperature
Zeqian Ren,
Qiwei Zhang,
Xiu Li,
Lixia Guo,
Jizhou Wu,
Yuqing Li,
Wenliang Liu,
Peng Li,
Yongming Fu,
Jie Ma
Affiliations
Zeqian Ren
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Qiwei Zhang
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Xiu Li
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Lixia Guo
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Jizhou Wu
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Yuqing Li
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Wenliang Liu
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Peng Li
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Yongming Fu
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Jie Ma
State Key Laboratory of Quantum Optics and Quantum Optics Devices, School of Physics and Electronic Engineering, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
The modulation of exciton energy and state density of layer-structured transition metal dichalcogenides (TMDs) is required for diverse optoelectronic device applications. Here, the spontaneous inversion of exciton state population in monolayer MoS2 is observed by turning the pump light power. The excitons prefer to exist in low energy state under low pump power, but reverse under high pump power. To discuss the mechanism in depth, we propose a semiclassical model by combining the rate equation and photo−exciton interaction. Considering the modifying of exciton−exciton annihilation, the spontaneous inversion of exciton state population is phenomenologically described.
