1. Institute
of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way, #16-16 Connexis, Singapore, Singapore 138632
2. Centre
for Advanced 2D Materials, National University of Singapore, 6 Science
Drive 2, Singapore, Singapore 117546
3. Department
of Physics, National University of Singapore, 2 Science Drive 3, Singapore, Singapore 117551
4. Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, Singapore 117543