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- W2007948478 abstract "We investigate mobility regimes for localized modes in the discrete nonlinear Schr{o}dinger (DNLS) equation with the cubic-quintic onsite terms. Using the variational approximation (VA), the largest soliton's total power admitting progressive motion of kicked discrete solitons is predicted, by comparing the effective kinetic energy with the respective Peierls-Nabarro (PN) potential barrier. The prediction is novel for the DNLS model with the cubic-only nonlinearity too, demonstrating a reasonable agreement with numerical findings. Small self-focusing quintic term quickly suppresses the mobility. In the case of the competition between the cubic self-focusing and quintic self-defocusing terms, we identify parameter regions where odd and even fundamental modes exchange their stability, involving intermediate asymmetric modes. In this case, stable solitons can be set in motion by kicking, so as to let them pass the PN barrier. Unstable solitons spontaneously start oscillatory or progressive motion, if they are located, respectively, below or above a mobility threshold. Collisions between moving discrete solitons, at the competing nonlinearities frame, are studied too." @default.
- W2007948478 created "2016-06-24" @default.
- W2007948478 creator A5030567408 @default.
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- W2007948478 date "2013-11-05" @default.
- W2007948478 modified "2023-09-25" @default.
- W2007948478 title "Mobility of solitons in one-dimensional lattices with the cubic-quintic nonlinearity" @default.
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- W2007948478 doi "https://doi.org/10.1103/physreve.88.052901" @default.
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