1. Research and Development Center for Solid State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
4. School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
5. Collaborative Innovation Centre of Quantum Matter, Beijing 100871, China
6. College of Science, China University of Petroleum, Qingdao 266580, China
7. Beijing Graphene Institute (BGI), Beijing 100095, China