1. Department of Physics, Indian Institute of Technology Delhi, New Delhi-110016, India
2. International College of Semiconductor Technology, National Yang Ming Chiao Tung University, Hsinchu City-300093, Taiwan
3. Directorate of Research, Innovation and Development, Jaypee Institute of Information Technology, Noida, U.P., 201309, India
4. Department of Electrical Engineering, Indian Institute of Technology Delhi, New Delhi-110016, India