1. Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Jiujiang Research Institute, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
2. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
3. College of Physics Science and Technology, Xinjiang University, Urumqi 830046, China