Internal localized eigenmodes on spin discrete breathers in antiferromagnetic chains with on-site easy axis anisotropy

TL;DR

This paper studies internal localized eigenmodes around spin discrete breathers in 1D antiferromagnetic chains with easy axis anisotropy, revealing their threshold behavior and validating findings through molecular dynamics simulations.

Contribution

It introduces a detailed analysis of internal localized eigenmodes in spin discrete breathers, highlighting their threshold structure and confirming results with simulations.

Findings

Threshold of internal localized eigenmodes depends on breather frequency

Linear analysis matches molecular dynamics simulation results

Internal localized eigenmodes have a characteristic parameter space structure

Abstract

We investigate internal localized eigenmodes of the linearized equation around spin discrete breathers in 1D antiferromagnets with on-site easy axis anisotropy. The threshold of occurrence of the internal localized eigenmodes has a typical structure in parameter space depending on the frequency of the spin discrete breather. We also performed molecular dynamics simulation in order to show the validity of our linear analysis.