1. National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
2. College of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
3. Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT, Nanjing 211106, China
4. State Key Laboratory of Organic/Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
5. School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, China
6. Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, United States
7. Institute of Materials Engineering, Nanjing University, Nantong, Jiangsu 226001, China