Properties of some breather solutions of a nonlocal discrete NLS equation

• Autores: Ben, Roberto Ignacio; Borgna, Juan Pablo; Panayotaros, Panayotis
• Año de publicación: 2017
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Discrete Nonlinear SchrÖDinger Equations; Nonlocal Effects; Localized Solutions; Breather Solutions; Linear Stability
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

We present results on breather solutions of a discrete nonlinear Schrödinger equation with a cubic Hartree-type nonlinearity that models laser light propagation in waveguide arrays that use a nematic liquid crystal substratum. A recent study of that model by Ben et al [R.I. Ben, L. Cisneros Ake, A.A. Minzoni, and P. Panayotaros, Phys. Lett. A, 379:1705C-1714, 2015] showed that nonlocality leads to some novel properties such as the existence of orbitaly stable breathers with internal modes, and of shelf-like configurations with maxima at the interface. In this work we present rigorous results on these phenomena and consider some more general solutions. First, we study energy minimizing breathers, showing existence as well as symmetry and monotonicity properties. We also prove results on the spectrum of the linearization around one-peak breathers, solutions that are expected to coincide with minimizers in the regime of small linear intersite coupling. A second set of results concerns shelf-type breather solutions that may be thought of as limits of solutions examined in [R.I. Ben, L. Cisneros Ake, A.A. Minzoni, and P. Panayotaros, Phys. Lett. A, 379:1705C-1714, 2015]. We show the existence of solutions with a non-monotonic front-like shape and justify computations of the essential spectrum of the linearization around these solutions in the local and nonlocal cases.
Fil: Ben, Roberto Ignacio. Universidad Nacional de General Sarmiento. Instituto del Desarrollo Humano; Argentina
Fil: Borgna, Juan Pablo. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Panayotaros, Panayotis. Universidad Nacional Autonoma de Mexico. Facultad de Ciencias; México