1. Department of Physics, National Institute of Technology, Srinagar 190006, Jammu and Kashmir, India
2. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
3. Department of Chemistry, University of Kashmir, Srinagar 190006, Jammu and Kashmir, India
4. UGC-DAE Consortium for Scientific Research, Indore 452001, India
5. Raja Ramanna Center for Advanced Technology, Indore 452013, India
6. Institute of Earth Sciences, Academia Sinica, Nankang, Taipei 11529, Taiwan