1. State Key Laboratory of Solid‐State LightingInstitute of SemiconductorsChinese Academy of Sciences Beijing 100083 China
2. Center for Nanochemistry (CNC)Beijing Science and Engineering Center for NanocarbonsCollege of Chemistry and Molecular EngineeringPeking University Beijing 100871 China
3. Beijing National Laboratory for Molecular Sciences Beijing 100871 China
4. Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Science Beijing 100049 China
5. School of MicroelectronicsUniversity of Chinese Academy of Sciences Beijing 101408 China
6. State Key Laboratory of Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of Sciences Beijing 100083 China
7. Electron Microscopy Laboratory, and International Center for Quantum MaterialsSchool of PhysicsPeking University Beijing 100871 China
8. Collaborative Innovation Centre of Quantum Matter Beijing 100871 China
9. Beijing Graphene Institute (BGI) Beijing 100095 P. R. China