1. Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. 2D Crystal Consortium, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
5. Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
6. Center for 2D and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
7. Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L8, Canada
8. Mechanical Design and Production Engineering Department, Cairo University, Giza 12613, Egypt
9. Walter Schottky Institute, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany
10. Institute of Physics, University of Münster, Wilhelm-Klemmstr. 10, 48149 Münster, Germany
11. U.S. Naval Research Laboratory, Washington, DC 20375, United States