* Corresponding authors

^a Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576104, India
E-mail: bv.rajendra@manipal.edu

^b Department of Atomic and Molecular Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576104, India
E-mail: suresh.dk@manipal.edu

^c School of Materials Science and Engineering, UNSW, Sydney, NSW, Australia

^d ARC Centre of Excellence in Future Low-Energy Electronics Technologies, UNSW, Sydney, NSW, Australia

^e DST Purse Lab, Mangalore University, Mangalagangotri, Mangalore-574199, India

^f College of Science and Engineering, Flinders University, Bedford Park, Adelaide, SA, Australia
E-mail: pankaj.sharma@flinders.edu.au

^g Flinders Institute for Nanoscale Science and Technology, Flinders University, Adelaide, SA, Australia