**Author details**

Emusani Ramya1 \* and D. Narayana Rao2

1 Department of Humanities and Science, CMR Institute of Technology, Hyderabad, Telangana, India

2 School of Physics, University of Hyderabad, Hyderabad, Telangana, India

\*Address all correspondence to: eramya@uohyd.ac.in

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