1. Department of Physics, Vidyasagar Metropolitan College, Kolkata-700006, India
2. Department of Physics, ADAMAS University, Kolkata-700126, India
3. Department of Physics, University of Calcutta, Kolkata-700009, India
4. Department of Physics, Tamkang University, New Taipei City-251301, Taiwan
5. Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata-700 108, India
6. Nano and Molecular Systems Research Unit (NANOMO), University of Oulu, Oulu, FIN-90014, Finland