1. Department of Chemistry, Visva-Bharati University, Santiniketan 731235, India
2. Department of Physics, Jadavpur University, Kolkata 700032, India
3. Bremen Center for Computational Materials Science, Universität Bremen, Am Fallturm 1, Bremen 28359, Germany
4. Post-Graduate Department of Physics, University of Jammu, Jammu 180006, India