1. SHU-Solar E R&D Lab, Department of Physics, College of Sciences, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai Frontiers Science Center of Quantum and Superconducting Matter States, Shanghai University, Shanghai200444, China
2. School of Physics and Technology, Center for Electron Microscopy, MOE Key Laboratory of Artificial Micro- and Nano-structures, and Institute for Advanced Studies, Wuhan University, Wuhan430072, China
3. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai200444, China
4. Department of Electronic Information Materials, School of Materials Science and Engineering, Shanghai University, Shanghai200444, China
5. Zhejiang Institute of Advanced Materials, Shanghai University, Jiashan314113, China
6. State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai200433, China