1. School of Physics and Technology, Center for Nanoscience and Nanotechnology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072, China
2. The Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
3. Ecole Polytechnique Fédérale de Lausanne, Institute of Physics, Lausanne CH-1015, Switzerland
4. Henan Key Laboratory of Diamond Optoelectronic Materials and Devices, Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China
5. Wuhan Institute of Quantum Technology, Wuhan 430206, China
6. School of Microelectronics, Wuhan University, Wuhan 430072, China