1. Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
2. Beijing Graphene Institute (BGI), Beijing 100095, People’s Republic of China
3. Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, People’s Republic of China
4. School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom