1. Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China
2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
3. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
4. Collaborative Innovation Centre of Quantum Matter, Beijing 100871, China
5. State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People’s Republic of China
6. Institute for Quantum Science and Engineering and Department of Physics, South University of Science and Technology of China, Shenzhen 518055, People’s Republic of China