1. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
2. Research Center for Wide Gap Semiconductor, Peking University, Beijing 100871, China
3. Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
4. Center for Nanochemistry (CNC), Academy for Advanced Interdisciplinary Studies, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
5. State Key Laboratory for Mesoscopic Physics and Department of Physics, Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China
6. School of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
7. School of Science, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
8. Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China