1. Department of Physics, Indian Institute of Technology Patna, 801106, India
2. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
3. Department of Chemistry, Indian Institute of Technology Patna, 801106, India
4. Department of Physics, Central University of South Bihar, 824236, India