Abstract
We discuss the existence of breathers and lower bounds on their power, in nonlinear Schrödinger lattices with nonlinear hopping. Our methods extend from a simple variational approach to fixed-point arguments, deriving lower bounds for the power which can serve as a threshold for the existence of breather solutions. Qualitatively, the theoretical results justify non-existence of breathers below the prescribed lower bounds of the power which depend on the dimension, the parameters of the lattice as well as of the frequency of breathers. In the case of supercritical power nonlinearities we investigate the interplay of these estimates with the optimal constant of the discrete interpolation inequality. Improvements of the general estimates, taking into account the localization of the true breather solutions are derived. Numerical studies in the one-dimensional lattice corroborate the theoretical bounds and illustrate that in certain parameter regimes of physical significance, the estimates can serve as accurate predictors of the breather power and its dependence on the various system parameters.
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Acknowledgements
We are indebted to Chris Eilbeck for having suggested us to consider the model presented in the manuscript. B.S.R. and J.C. acknowledge financial support from the MICINN project FIS2008-04848. P.G.K. gratefully acknowledges support from the US National Science Foundation via grants NSF-DMS-0806762 and NSFCMMI-1000337, from the US Air Force via award FA9550-12-1-0332, as well as from the Alexander von Humboldt Foundation, the Alexander S. Onassis Public Benefit Foundation via grant RZG 003/2010-2011 and the Binational Science Foundation via grant 2010239.
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Communicated by P. Newton.
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Karachalios, N.I., Sánchez-Rey, B., Kevrekidis, P.G. et al. Breathers for the Discrete Nonlinear Schrödinger Equation with Nonlinear Hopping. J Nonlinear Sci 23, 205–239 (2013). https://doi.org/10.1007/s00332-012-9149-y
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DOI: https://doi.org/10.1007/s00332-012-9149-y
Keywords
- Discrete Nonlinear Schrödinger equation
- Variational methods
- Fixed-point methods
- Nonlinear hopping
- Localization length
- Breathers
- Solitons
- Numerical results