1. Department of Physics, Southern Illinois University Carbondale, Carbondale, Illinois 62901, USA
2. Department of Physics, College of Education for Pure Science, University of Basrah, Basrah 61001, Iraq
3. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
4. Department of Physics and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
5. Department of Chemistry and Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA