Semiclassical approach to spin dynamics of a ferromagnetic S=1 chain
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866909274716766208 |
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| author | Li, Chengchen Cui, Yi Yu, Weiqiang Yu, Rong |
| author_facet | Li, Chengchen Cui, Yi Yu, Weiqiang Yu, Rong |
| contents | Motivated by recent experimental progress in 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 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_17416 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Semiclassical approach to spin dynamics of a ferromagnetic S=1 chain Li, Chengchen Cui, Yi Yu, Weiqiang Yu, Rong Strongly Correlated Electrons Motivated by recent experimental progress in 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 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. |
| title | Semiclassical approach to spin dynamics of a ferromagnetic S=1 chain |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2402.17416 |