1. State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University 1 , Beijing 100871, China
2. International Center for Quantum Materials, School of Physics, Peking University 2 , Beijing 100871, China
3. School of Microelectronics Science and Technology, Sun Yat-sen University 3 , Zhuhai 519082, China