1. Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad-826004, India
2. Department of Physics, Government Polytechnic Siwan, Bihar – 841203, India
3. Department of Physics, Shahid Chandrashekhar Azad Govt. P. G. College, Jhabua, Madhya Pradesh – 457661, India
4. Third Institute of Physics, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, Göttingen-37077, Germany