1. Materials Modelling Lab , Department of Physics , Islamia College University , Peshawar , Pakistan
2. Department of Physics , University of Peshawar , Khyber-Pakhtunkhwa , Pakistan
3. Department of Physics and Astronomy, College of Science , King Saud University , Riyadh 11451 , Kingdom of Saudi Arabia
4. Department of Physics , University of Agriculture , Faisalabad 38040 , Pakistan