1. Department of Materials Science & Engineering, National University of Singapore, 117576, Singapore
2. Condensed Matter Physics & Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, United States
3. Advanced
Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
4. Singapore Synchrotron Light Source (SSLS), National University of Singapore, 5 Research Link, 117603 Singapore
5. NUSNNI-Nanocore, National University of Singapore, 117411, Singapore
6. Department of Physics, National University of Singapore, 117542, Singapore
7. Department of Electrical & Computer Engineering, National University of Singapore, 117576, Singapore