1. Department of Physics, National University of Singapore, 2 Science Drive 3, 117551, Singapore
2. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
3. Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
4. Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, 117603, Singapore
5. Institute for Advanced Study and Department of Physics, Nanchang University, Nanchang 330031, PR China
6. State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
7. National University of Singapore (Suzhou) Research Institute, Suzhou 215123, PR China