1. School of Physics, University of Hyderabad, Prof. C. R. Rao Road, Hyderabad 500046, India
2. Advanced Center of Research in High Energy Materials (ACRHEM), University of Hyderabad, Prof. C. R. Rao Road, Hyderabad 500046, India
3. Center for Nanotechnology, University of Hyderabad, Prof. C. R. Rao Road, Hyderabad 500046, India