1. School of Integrated Circuit Science and Engineering, University of Electronic Sciences and Technology of China, Chengdu 610054, People’s Republic of China
2. Department of Physics, Comsats University Islamabad, Lahore Campus, Lahore 54000, Pakistan
3. Department of Physics, University of Sargodha, Sargodha 40100, Panjab
4. Department of Physics, Riphah International University, Lahore 54000, Pakistan
5. Physics Department Faculty of Science and Arts, King Khalid University, Muhayl Asser, Abha 61421, Saudi Arabia
6. Department of Physics, COMSATS University Islamabad, Lahore 54000, Pakistan