Affiliation: | 1. Salam Chair, Department of Physics, G. C. University Lahore, Katchery Road, Lahore 54000, Pakistan;2. Department of Physics, G. C. University Lahore, Katchery Road, Lahore 54000, Pakistan;3. Department of Physics, Mirpur University of Science and Technology, Mirpur-10250 (AJK), Pakistan |