1. NUSNNI‐NanoCore National University of Singapore Singapore 117411 Singapore
2. NUS Graduate School for Integrative Sciences and Engineering (NGS) National University of Singapore Singapore 117456 Singapore
3. Department of Physics National University of Singapore Singapore 117542 Singapore
4. Department of Physics University of Kalyani Kalyani West Bengal 741235 India
5. HORIBA FRANCE SAS HORIBA Scientific Palaiseau 91120 France
6. School of Chemical Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata West Bengal 700032 India
7. Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore
8. Department of Electrical and Computer Engineering Texas A&M University College Station TX 77843 USA
9. Materials Science and Engineering Department National University of Singapore Singapore 117575 Singapore