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- W1567601773 abstract "We describe a mechanism that results in the nonlinear instability of stationary states even in the case where the stationary states are linearly stable. This instability is due to the nonlinearity-induced coupling of the linearization's internal modes of negative energy with the wave continuum. In a broad class of nonlinear Schr{o}dinger (NLS) equations considered, the presence of such internal modes guarantees the nonlinear instability of the stationary states in the evolution dynamics. To corroborate this idea, we explore three prototypical case examples: (a) an anti-symmetric soliton in a double-well potential, (b) a twisted localized mode in a one-dimensional lattice with cubic nonlinearity, and (c) a discrete vortex in a two-dimensional saturable lattice. In all cases, we observe a weak nonlinear instability, despite the linear stability of the respective states." @default.
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- W1567601773 date "2015-05-29" @default.
- W1567601773 modified "2023-10-14" @default.
- W1567601773 title "When Linear Stability Does Not Exclude Nonlinear Instability" @default.
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- W1567601773 doi "https://doi.org/10.1103/physrevlett.114.214101" @default.
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