1. Department of Physics, School of Natural Sciences, Shiv Nadar University, Uttar Pradesh, India
2. Department of Chemistry, School of Natural Sciences, Shiv Nadar University, Uttar Pradesh, India
3. School of Physics, University of Hyderabad, Hyderabad, India
4. Surface Physics and Material Science Division, Saha Institute of Nuclear Physics, Bidhannagar, Kolkata, India
5. Department of Physics, University of California-San Diego, California, USA