1. Department of Physics, Beijing Normal University, Beijing 100875, China
2. Institute of Physics, Chinese Academic of Science, Beijing 100190, China
3. School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
4. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
5. Key Laboratory of Luminescence and Optical Information, Ministry of Education, Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, China
6. Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China
7. Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Science, Beijing 100190, China