1. Harish-Chandra Research Institute, Chhatnag Road, Jhunsi Prayagraj (Allahabad) 211019, India
2. School of Physical Sciences, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Kolkata 700032, India
3. Department of Physics, Indian Institute of Technology Kharagpur, West Bengal 721302, India