1. National Laboratory of Solid State Microstructures, Physics School, Nanjing University, Nanjing 210093, People's Republic of China
2. School of Information Engineering, Huangshan University, Huangshan 245041, People's Republic of China
3. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China
4. College of Physics Science, Qingdao University, Qingdao 266071, People's Republic of China