1. Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Haridwar, Uttarakhand 247667, India
2. Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST),Thuwal 23955-6900, Saudi Arabia
3. Department of Chemistry, University of Victoria, Victoria, BC V8W 2Y2, Canada
4. Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700032, India