1. Department
of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551
2. Centre
for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117542
3. Institute of High Performance Computing, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632
4. Department
of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583