1. Department of Physics, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, India
2. Department of Physics, Dinabandhu Andrews College, 54 Raja S.C. Mallick Road, Kolkata 700084, India
3. Graduate School of Science and Technology, Shizuoka University, 836 Oya, Suruga-ku, Shizuoka 422-8017, Japan
4. Department of Electronics, Vidyasagar College, 39 Sankar Ghosh Lane, Kolkata 700006, India
5. UGC-DAE Consortium for Scientific Research, Indore 452017, India