1. Institute of Microelectronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
2. Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
3. Beijing Graphene Institute, Beijing 100095, China
4. Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
5. Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
6. Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China
7. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
8. Collaborative Innovation Center of Quantum Matter, Beijing 100871, China