Discrete vortices on anisotropic lattices

doi:10.1007/s11467-015-0494-9

Front. Phys.

2015, Vol. 10

Issue (4) : 104206 https://doi.org/10.1007/s11467-015-0494-9

RESEARCH ARTICLE

Discrete vortices on anisotropic lattices

Gui-Hua Chen(

),Hong-Cheng Wang,Zi-Fa Chen

Department of Electronic Engineering, Dongguan University of Technology, Dongguan 523808, China

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Abstract

We consider the effects of anisotropy on two types of localized states with topological charges equal to 1 in two-dimensional nonlinear lattices, using the discrete nonlinear Schr?dinger equation as a paradigm model. We find that on-site-centered vortices with different propagation constants are not globally stable, and that upper and lower boundaries of the propagation constant exist. The region between these two boundaries is the domain outside of which the on-site-centered vortices are unstable. This region decreases in size as the anisotropy parameter is gradually increased. We also consider off-site-centered vortices on anisotropic lattices, which are unstable on this lattice type and either transform into stable quadrupoles or collapse. We find that the transformation of off-sitecentered vortices into quadrupoles, which occurs on anisotropic lattices, cannot occur on isotropic lattices. In the quadrupole case, a propagation-constant region also exists, outside of which the localized states cannot stably exist. The influence of anisotropy on this region is almost identical to its effects on the on-site-centered vortex case.

Keywords anisotropy discrete vortex quadrupole localized state

Corresponding Author(s): Gui-Hua Chen

Issue Date: 17 August 2015

Cite this article:

Gui-Hua Chen,Hong-Cheng Wang,Zi-Fa Chen. Discrete vortices on anisotropic lattices[J]. Front. Phys. , 2015, 10(4): 104206.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-015-0494-9
https://academic.hep.com.cn/fop/EN/Y2015/V10/I4/104206

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