Semiclassical approach to spin dynamics of a ferromagnetic S = 1 chain

Motivated by recent experimental progress on the quasi-one-dimensional quantum magnet NiNb 2 O 6 , 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 f...

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Published in:Chinese physics B 2024-06, Vol.33 (6), p.67501
Main Authors: Li, Chengchen, Cui, Yi, Yu, Weiqiang, Yu, Rong
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Language:English
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magnon excitation
molecular dynamics
one-dimensional ferromagnetism
spin dynamics
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Yu, Weiqiang
Yu, Rong
description Motivated by recent experimental progress on the quasi-one-dimensional quantum magnet NiNb 2 O 6 , 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 response 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 the experimental detection of spin excitations in a large class of quasi-one-dimensional magnets.
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subjects magnon excitation
molecular dynamics
one-dimensional ferromagnetism
spin dynamics
title Semiclassical approach to spin dynamics of a ferromagnetic S = 1 chain
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