1. Department of Physics, Central University of Tamil Nadu, Thiruvarur, Tamil Nadu 610005, India
2. Simulation Center for Atomic and Nanoscale MATerials, Central University of Tamil Nadu, Thiruvarur, Tamil Nadu 610005, India
3. Center for Materials Science and Nanotechnology and Department of Chemistry, University of Oslo, Box
1033 Blindern, N-0315 Oslo, Norway