Modulational instability in a biexciton molecular chain with saturable nonlinearity effects

Journal article

Authors / Editors

Tabi, Condrad

Research Areas

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Publication Details

Author list: Sali I, Tabi CB, Ekobena HP, Kofane TC

Publisher: World Scientific Publishing

Place: SINGAPORE

Publication year: 2016

Journal: International Journal of Modern Physics B (0217-9792)

Journal acronym: INT J MOD PHYS B

Volume number: 30

Issue number: 1

Number of pages: 9

ISSN: 0217-9792

eISSN: 1793-6578

Languages: English-Great Britain (EN-GB)

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Abstract

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 Schrodinger 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.

Keywords

biexciton molecular chains, Modulational instability, saturable nonlinearity

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