1. Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. Research Initiative for Supra Materials, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
4. Departamento de Física, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte 59078-970, Brazil
5. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
6. Department of Physics, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro 22451900, Brazil
7. Centro de Tecnologia em Nanomateriais (CT Nano), Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30161-970, Brazil
8. Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
9. Department of Physics, Binghamton University, Binghamton, New York 13902, United States