1. Institute of Optoelectronics & Zhangjiang Fudan International Innovation Center Fudan University Shanghai 200438 China
2. Frontier Institute of Chip and System & Zhangjiang Fudan International Innovation Center Fudan University Shanghai 200438 China
3. Institute of Materials Research and Engineering Agency for Science, Technology and Research 2 Fusionopolis Way, Innovis, #08‐03 Singapore 138634 Singapore
4. Department of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore
5. Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore Singapore 117575 Singapore
6. Leibniz‐Institut für Kristallzüchtung Max Born Str 2 Berlin 12489 Germany
7. Department of Physics National University of Singapore, Singapore Science Drive 3 Singapore 117551 Singapore
8. Department of Biomedical Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117583 Singapore