1. Department of Physics, Savitribai Phule Pune University, Pune 411007, Maharashtra, India
2. Department of Physics, Fergusson College (Autonomous), Pune 411004, Maharashtra, India
3. Environmental Science and Engineering, University of Texas at El Paso, 500 W. University Ave., El Paso, Texas 79968, United States
4. Centre for Advanced Materials Research (CMR), University of Texas at El Paso, El Paso, Texas 79968, United States
5. Department of Aerospace & Mechanical Engineering, University of Texas at El Paso, El Paso, Texas 79968, United States