1. CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P.R. China
2. University of Chinese Academy of Sciences, Beijing 100049, P.R. China
3. Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325000, People’s Republic of China
4. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, P.R. China
5. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P.R. China
6. Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
7. Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China
8. State Key Laboratory of Molecular Reaction Dynamics and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
9. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
10. State Key Laboratory for Turbulence and Complex System, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, P.R. China
11. Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing 100871, P.R. China
12. State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, and Center of Materials Science and Optoelectronics Engineering, Chinese Academy of Sciences, Beijing 100083, China