1. Department of Physics, Michigan Technological University, Houghton, Michigan 49931, United States
2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu City 300093, Taiwan
4. 2D Crystal Consortium Materials Innovation Platform, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
5. Department of Chemistry and Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States