1. Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117583 Singapore
2. Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117551 Singapore
3. Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore
4. NUS Graduate School for Integrative Sciences and Engineering National University of Singapore University Hall, Tan Chin Tuan Wing Singapore 119077 Singapore
5. Singapore Synchrotron Light Source (SSLS) National University of Singapore 5 Research Link Singapore 117603 Singapore
6. Institute of Electronics, Microelectronics, and Nanotechnology, IEMN DOAE Université Polytechnique Hauts‐de‐France Valenciennes 59309 France