1. Department of Physics and Nanotechnology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India
2. Department of Mechanical Engineering, University of California, Santa Barbara, California 93106, United States
3. Department of Physics, Michigan Technological University, Houghton, Michigan 49931, United States
4. Quantum Functional Semiconductor Research Centre (QSRC), Institute of Future Technology, Dongguk University, Seoul 04620, Republic of Korea
5. Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India