1. Department of Physics, School of Basic and Applied Sciences, Central University of Tamil Nadu(CUTN), Thiruvarur, India.
2. The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy.
3. Department of Physics, Periyar University, Salem, India.
4. Center for Nanoscience and Nanotechnology, Periyar University, Salem, India.
5. Department of Chemistry, Periyar University, Salem, India.