1. Songshan Lake Materials Laboratory, Dongguan523808, P. R. China
2. State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing100871, P. R. China
3. International Center for Quantum Materials, School of Physics, Peking University, Beijing100871, P. R. China
4. Collaborative Innovation Center of Quantum Matter, Beijing100871, P. R. China
5. Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing100871, P. R. China
6. The Institute of Physics, Chinese Academy of Sciences, Beijing100190, P. R. China
7. Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing100871, P. R. China