1. SZU‐NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics, Shenzhen University Shenzhen 518060 China
2. Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore
3. Centre for Advanced 2D Materials and Graphene Research Centre National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore
4. ARC Centre for Future Low Energy Electronics Technologies School of Physics and Astronomy Monash University Clayton VIC 3800 Australia