1. Centre for Physical Mechanics and Biophysics, School of Physics, Sun Yat-sen University, Guangzhou 510275, China
2. Condensed Matter Physics & Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, United States
3. Department of Materials Science & Engineering, National University of Singapore, 117575, Singapore
4. Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
5. Petroleum and Chemical Industry Federation Key Laboratory of Oil and Gas Terahertz Spectroscopy and Photoelectric Detection, China University of Petroleum, Beijing 102249, China
6. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States