1. School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072, China
2. Wuhan Institute of Quantum Technology, Wuhan 430206, China
3. School of Microelectronics, Wuhan University, Wuhan 430072, China
4. Henan Academy of Sciences, Zhengzhou, Henan 450046 China