1. School of Physics, University of Hyderabad, Hyderabad, India
2. Department of Physics, GITAM (Deemed to be University), Hyderabad, India
3. Department of Physics, B. V. Raju Institute of Technology, Vishnupur, India
4. Centre for Nanoscience and Technology, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, India