1. Department of Applied Physics, Nanjing University of Science and Technology 1 , Nanjing, Jiangsu 210094, China
2. Department of Experimental Teaching, Northwest Minzu University 2 , Lanzhou, Gansu 730030, China
3. MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Engineering Research Center of Semiconductor Device Optoelectronic Hybrid Integration in Jiangsu Province 3 , Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China