1. Center for Nanochemistry (CNC),
Beijing National Laboratory for Molecular Sciences, College of Chemistry
and Molecular Engineering, Academy for Advanced Interdisciplinary
Studies, Peking University, Beijing 100871,
People’s Republic of China
2. Department of Materials Science
and Engineering, College of Engineering, Peking University, Beijing 100871, People’s Republic of China
3. State Key Laboratory of Superlattices
and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People’s
Republic of China
4. International
Center for Quantum
Materials, School of Physics, Peking University, Beijing 100871, People’s Republic of China
5. Center for Applied Physics and
Technology, Peking University, Beijing
100871, People’s Republic of China