1. Chaos and Complex Systems Research Laboratory, Department of Physics, University of Burdwan, Burdwan, 713 104 West Bengal, India
2. Department of Physics, Rampurhat College, Birbhum, 731 224 West Bengal, India
3. Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany