1. Academy of Scientific and Innovative Research, CSIR-HRDC Campus, Ghaziabad, Uttar Pradesh 201002, India
2. CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India
3. School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
4. Solid State Physics Laboratory, Defence Research and Development Organization, Timarpur, Delhi 110054, India