1. Key Laboratory of Flexible Electronics and Institute of Advanced Materials; Jiangsu National Synergetic Innovation Center for Advanced Materials; Nanjing Tech University; 30 South Puzhu Road Nanjing 211816 China
2. Department of Materials Science and Engineering; College of Engineering; Peking University; Beijing 100871 China
3. Research Center for Wide Gap Semiconductor; Peking University; Beijing 100871 China
4. Electron Microscopy Laboratory; School of Physics; Peking University; Beijing 100871 China
5. Center for Nanochemistry; Beijing National Laboratory for Molecular Sciences; College of Chemistry and Molecular Engineering; Academy for Advanced Interdisciplinary Studies; Beijing National Laboratory for Molecular Sciences; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 China
6. 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
7. State Key Laboratory of Superlattices and Microstructures; Institute of Semiconductors; Chinese Academy of Sciences; Beijing 100083 China
8. College of Materials Science and Opto-Electronic Technology; University of Chinese Academy of Sciences; Beijing 100049 China
9. International Center for Quantum Materials; School of Physics; Peking University; Beijing 100871 China
10. Collaborative Innovation Center of Quantum Matter; Beijing 100871 China
11. Joint Key Laboratory of the Ministry of Education; Institute of Applied Physics and Materials Engineering; University of Macau; Avenida da Universidade; Taipa Macao, SAR 999078 China