Affiliation: | 1. Department of Physics, Motilal Nehru National Institute of Technology, Allahabad, 211004, India 2. Department of Physics, IIT Bombay, Powai, Mumbai, 400076, India 3. Nanotechnology Application Centre (NAC), University of Allahabad, Allahabad, 211002, India 4. Department of Physics, University of Lucknow, Lucknow, 226007, India
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