1. Shenzhen Engineering Center for the Fabrication of Two‐Dimensional Atomic Crystals Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 P. R. China
2. Faculty of Physics and Electronic Science Hubei University Wuhan 430062 P. R. China
3. School of Electronic and Computer Engineering Peking University Shenzhen Graduate School Shenzhen 518055 P. R. China
4. University of Chinese Academy of Sciences Beijing 100049 P. R. China
5. Institute for Advanced Study Chengdu University Chengdu 610106 P. R. China
6. School of Microelectronics Fudan University Shanghai 200000 P. R. China
7. Department of Physics Department of Materials Science and Engineering and Department of Biomedical Engineering City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China