Nonlinear stationary states in PT-symmetric lattices
Abstract
In the present work we examine both the linear and nonlinear properties of two related PT-symmetric systems of the discrete nonlinear Schrodinger (dNLS) type. First, we examine the parameter range for which the finite PT-dNLS chains have real eigenvalues and PT-symmetric linear eigenstates. We develop a systematic way of analyzing the nonlinear stationary states with the implicit function theorem at an analogue of the anti-continuum limit for the dNLS equation. Secondly, we consider the case when a finite PT-dNLS chain is embedded as a defect in the infinite dNLS lattice. We show that the stability intervals of the infinite PT-dNLS lattice are wider than in the case of a finite PT-dNLS chain. We also prove existence of localized stationary states (discrete solitons) in the analogue of the anti-continuum limit for the dNLS equation. Numerical computations illustrate the existence of nonlinear stationary states, as well as the stability and saddle-center bifurcations of discrete solitons.
Keywords
Cite
@article{arxiv.1303.3298,
title = {Nonlinear stationary states in PT-symmetric lattices},
author = {Panayotis G. Kevrekidis and Dmitry E. Pelinovsky and Dmitry Y. Tyugin},
journal= {arXiv preprint arXiv:1303.3298},
year = {2013}
}
Comments
28 pages