Universite Cote d'Azur, Institut de Physique de Nice, Parc Valrose, 06108 Nice, France.
Department of Physics, Indian Institute of Technology Guwahati, India.
TCG Centres for Research and Education in Science and Technology, Kolkata, India.
Department of Physics, Guru Nanak Dev University, Amritsar, India.
Physical Research Laboratory, Ahmedabad, India.