arXiv subjects

Bikash Chandra Gupta

Publications and source records attributed to Bikash Chandra Gupta.

3 recordsLinked to original sources

arXiv2000

New way to achieve chaotic synchronization in spatially extended systems

We study the spatio-temporal behavior of simple coupled map lattices with periodic boundary conditions. The local dynamics is governed by two maps, namely, the sine circle map and the logistic map respectively. It is found that even though the spatial behavior is irregular for the regularly coupled (nearest neighbor coupling) system, the spatially synchronized (chaotic synchronization) as well as periodic solution may be obtained by the introduction of three long range couplings at the cost of three nearest neighbor couplings.

cond-mat↗

arXiv1999

Dissipative tunneling in presence of classical chaos in a mixed quantum-classical system

We consider the tunneling of a wave packet through a potential barrier which is coupled to a nonintegrable classical system and study the interplay of classical chaos and dissipation in the tunneling dynamics. We show that chaos-assisted tunneling is further enhanced by dissipation, while tunneling is suppressed by dissipation when the classical subsystem is regular.

chao-dyn↗

arXiv1998

Localized states due to the coupling of exciton with the coupled lattice oscillators

Discrete nonlinear Schröginger equation (DNLS) of the form, $i \frac{dC_n} {dt}$ = $C_{n+1}$ + $C_{n-1}$ - $ χ_n [|C_{n+1}|^2 + |C_{n-1}|^2 - 2 |C_n|^2] C_n$ is used to study the formation of stationary localized states in one dimensional system due to a single as well as a dimeric nonlinear impurity. The fully nonlinear chain is also considered. The stability of the states and its connection with the nonlinear strength is presented. Results are compared with those obtained from other DNLS. It is found that the DNLS used in this paper has more impact in the formation of stationary localized states.

cond-mat.dis-nn↗