1. State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
2. Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China
3. Wuhan Institute of Quantum Technology, Wuhan 430206, China
4. School of Microelectronics, Wuhan University, Wuhan 430072, China
5. Hubei Luojia Laboratory, Wuhan, China