Semiclassical approach to spin dynamics of a ferromagnetic S=1 chain
Abstract
Motivated by recent experimental progress in the quasi-one-dimensional quantum magnet NiNbO, we study the spin dynamics of an S=1 ferromagnetic Heisenberg chain with single-ion anisotropy by using a semiclassical molecular dynamics approach. This system undergoes a quantum phase transition from a ferromagnetic to a paramagnetic state under a transverse magnetic field, and the magnetic responses reflecting this transition is well described by our semiclassical method. We show that at low-temperature the transverse component of the dynamical structure factor depicts clearly the magnon dispersion, and the longitudinal component exhibits two continua associated with single- and two-magnon excitations, respectively. These spin excitation spectra show interesting temperature dependence as effects of magnon interactions.Our findings shed light on experimental detection of spin excitations in a large class of quasi-one-dimensional magnets.
Keywords
Cite
@article{arxiv.2402.17416,
title = {Semiclassical approach to spin dynamics of a ferromagnetic S=1 chain},
author = {Chengchen Li and Yi Cui and Weiqiang Yu and Rong Yu},
journal= {arXiv preprint arXiv:2402.17416},
year = {2024}
}