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. Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
4. Directorate of Research, Innovation and Development, Jaypee Institute of Information Technology, Noida 201309 Uttar Pradesh, India
5. Department of Electrical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India