1. National Institute of Technology Karnataka, Mangaluru, Karnataka, India
2. Department of Physics, University of Calcutta, Kolkata, West Bengal, India
3. Department of Physics, IIT Kharagpur, Kharagpur, West Bengal, India
4. Department of Physics, Visva-Bharati University, Santiniketan, West Bengal, India
5. Government General Degree College at Kushmandi, Kushmandi, West Bengal, India