1. Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, Block-JD, Sector-III, Kolkata700106, India
2. Department of Electrical Engineering, IIT Bombay, Mumbai, Maharashtra400076, India
3. Technical Research Centre, S. N. Bose National Centre for Basic Sciences, Salt Lake, Block-JD, Sector-III, Kolkata700106, India
4. CSIR-Central Glass and Ceramic Research Institute, Raja S C Mullick Road, Kolkata700-032, India