Institution: | 1. Department of Physics, Acharya Prafulla Chandra College, New Barrackpore, Kolkata 700131, India;2. Department of Physics, School of Mathematical Sciences, Ramakrishna Mission Vivekananda Educational and Research Institute, Belur Math, Howrah 711202, India;3. Institut für Physik, Universität Kassel, Kassel 34109, Germany |