1. Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata 700 106, India
2. School of Applied and Interdisciplinary Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Kolkata 700032, India
3. Department of Material Science and Engineering, Tripura University (A Central University), Suryamaninagar, Agartala, Tripura 799 022, India