Modulation instability gain and discrete soliton interaction in gyrotropic molecular chain.

In this paper, we considered a discrete coupled nonlinear Schrödinger equations (CNLSEs) which describes the propagation of solitonic waves in a gyrotropic molecular chain (GMC) of left and right circularly polarized intramolecular vibrations. From the linear analysis, we shown the forward and backward waves for left and right-handed modes. We underlined the effects of the gyrotropy term and effective mass (EM) on both modulation instability (MI) gain and modulated wave (MW) pattern. It reveals for strong enough values of these parameters that the generation of new sides lobes and MI bands. For numerical simulation, we shown out the propagation and interaction of the MW bright-soliton with high energy on the peak. It results from this investigation that gyrotropy term and EM behave as being energy sources in GMC. Finally, the reported outcomes can be used during the transfer of energy in molecular chain. • We studied discrete coupled nonlinear Schrodinger equations. • These equations describe the propagation of solitonic waves in a gyrotropic molecular chain. • We exhibited the discrete solitons interaction in the gyrotropic molecular chain • We investigated the effects of gyrotropy term and effective mass on the modulated waves. • The linear analysis and modulation instability are provided. [ABSTRACT FROM AUTHOR]