1. State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano‐optoelectronics, School of Physics Peking University Beijing 100871 China
2. Electron Microscopy Laboratory, School of Physics Peking University Beijing 100871 China
3. Peking University Yangtze Delta Institute of Optoelectronics Nantong Jiangsu 226010 China
4. Collaborative Innovation Center of Quantum Matter, School of Physics Peking University Beijing 100871 China