1. School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia
2. Monash Centre for Atomically Thin Materials, Monash University, Clayton, Victoria 3800, Australia
3. ARC Centre for Future Low Energy Electronics Technologies, Monash University, Clayton, Victoria 3800, Australia
4. Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia
5. Australian Synchrotron, Clayton, Victoria 3168, Australia
6. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
7. Department of Physics, La Trobe University, Bundoora, Victoria 3086, Australia