1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
2. National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), the State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
3. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
4. Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China
5. Shenzhen Research Institute, City University of Hong Kong,, Shenzhen 518057, People’s Republic of China