1. Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India
2. Department of Physics, Indian Institute of Technology Jodhpur, Jodhpur 342030, India
3. Department of Biochemistry, Institute of Science, Banaras Hindu University, Varanasi 221005 India
4. Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi 221005, India