1. Department of Materials Science and Engineering, Center for Two-Dimensional and Layered Materials, Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Department of Physics, Center for Two-Dimensional and Layered Materials, Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
4. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
5. Nanoscience Technology Center, Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida 32826, United States
6. Department of Mechanical Engineering and Material Science, Yale School of Engineering and Applied Sciences, New Haven, Connecticut 06520, United States
7. Birck Nanotechnology Center & Department of ECE, Purdue University, West Lafayette, Indiana 47907, United States
8. Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
9. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
10. Center for Nanophase Materials Sciences and Computer Science & Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
11. Department of Physics, University of California at Berkeley, Berkeley, California 94720, United States
12. Lawrence Berkeley National Lab, Berkeley, California 94720, United States
13. Department of Materials Science & Nano Engineering, Rice University, Houston, Texas 77005, United States
14. Air Force Laboratory, Materials & Manufacturing directorate, Wright-Patterson AFB, Dayton, Ohio 45433, United States
15. UES Inc., Beavercreek, Ohio 45432, United States
16. Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, United States
17. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
18. Microelectronics Research Centre, The University of Texas at Austin, Austin, Texas 78758, United States
19. Electrical and Computer Engineering Department, University of California at Santa Barbara, Santa Barbara, California 93106, United States
20. Department of Chemistry and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States