1. Department of Materials Science and Engineering; College of Engineering; Peking University; Beijing 100871 P. R. China
2. Center for Nanochemistry (CNC); Beijing Science and Engineering Center for Nanocarbons; Beijing National Laboratory for Molecular Sciences; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 P. R. China
3. International Center for Quantum Materials; School of Physics; Peking University; Beijing 100871 P. R. China
4. Collaborative Innovation Center of Quantum Matter; Beijing 100871 P. R. China
5. State Key Laboratory of Optoelectronic Materials and Technologies; Guangdong Province Key Laboratory of Display Material and Technology; School of Electronics and Information Technology; Sun Yat-sen University; Guangzhou 510275 P. R. China
6. Beijing National Laboratory for Condensed Matter Physics; Institute of Physics; Chinese Academy of Sciences; Beijing 100190 P. R. China
7. School of Physical Sciences; University of Chinese Academy of Sciences; Beijing 100049 P. R. China
8. State Key Laboratory for Advanced Metals and Materials; School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083 P. R. China
9. CAS Center for Excellence in Topological Quantum Computation; University of Chinese Academy of Sciences; Beijing 100190 P. R. China