1. School of Microelectronics, Tianjin University, Tianjin, China
2. Centre of Excellent Solid State, University of the Punjab, Lahore, Pakistan
3. Centre for High Energy Physics, University of the Punjab, Lahore, Pakistan
4. School of Chemistry, University of the Punjab, Lahore, Pakistan
5. Department of Physics, University of Management and Technology, Lahore 54000, Pakistan
6. Department of Physics, University of Education Township, Lahore, Pakistan