**Author details**

Sukhmander Singh<sup>1</sup> \*, Sanjeev Kumar<sup>2</sup> , Shravan Kumar Meena<sup>2</sup> and Sujit Kumar Saini<sup>2</sup>

1 Department of Physics, Central University of Rajasthan, Ajmer, Kishangarh, India

2 Department of Physics, Motilal Nehru College University of Delhi, Delhi, India

\*Address all correspondence to: sukhmandersingh@curaj.ac.in

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