1. Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, 200240 Shanghai, China
2. State Key Laboratory for Mesoscopic Physics, Frontiers Science Centre for Nano-Optoelectronics, School of Physics, Peking University, 100871 Beijing, China
3. International Laboratory for Quantum Functional Materials of Henan, School of Physics and Microelectronics, Zhengzhou University, 450001 Zhengzhou, China