1. NUS Graduate School for Integrative Sciences & Engineering (NGS), National University of Singapore, Singapore, 117456, Singapore
2. Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore
3. Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom
4. Institute for Infocomm
Research, A*STAR, 138632, Singapore
5. Department of Materials, Imperial College London, London SW7 2AZ, United Kingdom
6. Data Storage Institute,
A*STAR, 117608, Singapore