1. Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India
2. CNRS, Univ. Bordeaux, Bordeaux INP, ICMB UMR 5026, Pessac F-33600, France
3. Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, India
4. DST PURSE Program, Mangalore University, Mangalagangotri, Mangalore 574199, Karnataka, India