1. Department of Physics, Netaji Subhas University of Technology, Sector 3, Dwarka, New Delhi - 110078, India
2. Material Science, Department of Physics, SRM University, Delhi-NCR Sonepat - 131029, Haryana, India
3. Department of Applied Physics, Delhi Technological University, Delhi - 110042, India
4. Materials Research Laboratory, Department of Physics, DCR University of Science and Technology, Sonepat - 131039, Haryana, India