1. Center
for Nanochemistry, Beijing National Laboratory for Molecular Sciences,
State Key Laboratory for Structural Chemistry of Unstable and Stable
Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
2. Institute of Physics and Beijing National Laboratory for Condensed
Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
3. Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China
4. Department of Physics, Fudan University, Shanghai 200433, China
5. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
6. Department of Materials
Science and Engineering, College of Engineering, Peking University, Beijing 100871, China