1. Department of Physics and Center for Energy Science, Indian Institute of Science Education and Research (IISER), Pune 411008, India
2. Department of Physics, Savitribai Phule Pune University, Pune 411007, India
3. LITEN Group, CEA Grenoble, 17 Avenue des Martyrs, 38054 Grenoble Cedex 9, France
4. Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box-516, Uppsala SE-75120, Sweden