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2017 ; 473
(2203
): 20170243
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Modulational instability, beak-shaped rogue waves, multi-dark-dark solitons and
dynamics in pair-transition-coupled nonlinear Schrödinger equations
#MMPMID28804266
Zhang G
; Yan Z
; Wen XY
Proc Math Phys Eng Sci
2017[Jul]; 473
(2203
): 20170243
PMID28804266
show ga
The integrable coupled nonlinear Schrödinger equations with four-wave mixing are
investigated. We first explore the conditions for modulational instability of
continuous waves of this system. Secondly, based on the generalized N-fold
Darboux transformation (DT), beak-shaped higher-order rogue waves (RWs) and
beak-shaped higher-order rogue wave pairs are derived for the coupled model with
attractive interaction in terms of simple determinants. Moreover, we derive the
simple multi-dark-dark and kink-shaped multi-dark-dark solitons for the coupled
model with repulsive interaction through the generalizing DT. We explore their
dynamics and classifications by different kinds of spatial-temporal distribution
structures including triangular, pentagonal, 'claw-like' and heptagonal patterns.
Finally, we perform the numerical simulations to predict that some dark solitons
and RWs are stable enough to develop within a short time. The results would
enrich our understanding on nonlinear excitations in many coupled nonlinear wave
systems with transition coupling effects.