1. Department of Physics, School of Basic and Applied Sciences, Central University of Tamilnadu (CUTN), Thiruvarur 610 101, Tamil Nadu, India
2. The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy
3. Department of Physics, Periyar University, Salem 636 011, Tamil Nadu, India
4. Department of Science and Humanities, Saveetha School of Engineering, Saveetha University, Chennai 600 077, Tamil Nadu, India
5. Department of Chemistry, Periyar University, Salem 636 011, Tamil Nadu, India
6. Center for Nanoscience and Nanotechnology, Periyar University, Salem 636 011, Tamil Nadu, India