[1] School of Basic Science and Humanities, German Jordanian University, Amman, Jordan
[2] Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville,AR, United States
[3] Department of Electrical Engineering, University of Arkansas, Fayetteville,AR, United States
[4] Physics Department, University of Arkansas, Fayetteville,AR, United States
[5] Department of Physics, King Khalid University, Abha, Saudi Arabia