1. Department of Physics, Riphah International University, Lahore, Pakistan
2. Department of Physics & Astronomy, College of Sciences, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
3. Department of Physics, University of Education, Lahore, Pakistan
4. Department of Physics, National Taiwan University, Taipei City, 10617, Taiwan
5. Center for Hybrid Nanostructures (CHyN) and Fachbereich Physik, Universität Hamburg, Hamburg, 20146, Germany
6. Department of Physics, University of Management and Technology, Lahore, Pakistan