1. Beijing National Laboratory for Condensed Matter Physics, Institute of physics, Chinese Academy of Sciences, Beijing, 100190, China
2. School of Physics, University of Chinese Academy of Sciences, Beijing, 100049, China
3. Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
4. Department of Physics & Astronomy and Quantum Matter Institute, University of British Columbia, Vancouver, Canada, BC V6T 1Z1
5. National Center for Electron Microscopy in Beijing and School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China