[1] Amity Univ, Amity Inst Appl Sci AIAS, Dept Appl Phys, Noida, Uttar Pradesh, India
[2] Univ Delhi, Mat Sci Res Lab Theory & Expt, Dept Phys, ARSD Coll, New Delhi, India
[3] DN Coll, Dept Phys, Meerut, Uttar Pradesh, India
[4] SRM Inst Sci & Technol, Dept Phys, Delhi NCR Campus Modinagar, Ghaziabad, India