1. Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
2. School of Physics, University of Hyderabad, Hyderabad 500046, India
3. Centre for Ion Beam Applications (CIBA), Department of Physics, National University of Singapore, Singapore 117542
4. Centre for Advanced Studies in Electronics Science and Technology (CASEST), School of Physics, University of Hyderabad, Hyderabad 500046, India
5. Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
6. Centre for Advanced 2D Materials (CA2DM), National University of Singapore, Singapore 117546