1. 2D Materials and Devices Laboratory (2DML), Sir C. V. Raman Research Park, Department of Physics and Nanotechnology, SRM Institute of Science and Technology (SRMIST), Kattankulathur 603203, Chennai, India
2. School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center, Chonbuk National University, Jeonju 54896, South Korea
3. Nano Functional Materials Technology Centre, Department of Physics, Indian Institute of Technology Madras, Madras 600036, Chennai, India
4. Nanotechnology Research Centre, SRM Institute of Science and Technology (SRMIST), Kattankulathur 603203, Chennai, India