1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
2. Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, People's Republic of China
3. Electron Microscope Laboratory, School of Physics, Peking University, Beijing 100871, People's Republic of China
4. International Center for Quantum Materials, Peking University, Beijing 100871, People's Republic of China
5. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100080, People's Republic of China
6. School of Material Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, People's Republic of China