1. College of Physics and Center of Quantum Materials & Devices Chongqing University Chongqing 401331 P. R. China
2. Interdisciplinary Center for Fundamental and Frontier Sciences Nanjing University of Science and Technology Jiangyin 214443 P. R. China
3. Max Planck Institute for Chemical Physics of Solids 01187 Dresden Germany
4. College of Materials Science and Engineering and Center of Quantum Materials & Devices Chongqing University Chongqing 401331 P. R. China
5. Analytical and Testing Center Chongqing University Chongqing 401331 P. R. China