Modulational instability in a biexciton molecular chain with saturable nonlinearity effects

Issa Sali, C. B. Tabi, H. P. Ekobena, T. C. Kofané

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In this paper, we study the modulational instability (MI) in a biexciton molecular chain taking into account the saturable nonlinearity effects (SNE). Under the adiabatic approximation, the biexciton system is reduced to two coupled nonlinear Schrödinger equations. We perform the linear stability analysis of continuous wave solutions of the coupled system. This analysis reveals that the MI gain is deeply influenced by the SNE. Indeed, the gain spectrum decreases when increasing the saturable nonlinearity parameters. The numerical simulations reveal that the system exhibits incoherent periodic array of patterns and we also observe train of pulses due to the SNE.

Original languageEnglish
Article number1550244
JournalInternational Journal of Modern Physics B
Issue number1
Publication statusPublished - Jan 10 2016


All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

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