Infinite temperature transport in the strong coupling regime of a nonintegrable quantum spin chain
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866910920708456448 |
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| author | Li, Zhi-Hua |
| author_facet | Li, Zhi-Hua |
| contents | We study spin transport of the XXZ model with next-nearest neighbor $Δ_2$ terms. We compute numerically dependence of spin conductivity $σ(ω)$ on the anisotropy $Δ$ and the ratio $r= Δ_2/Δ$, in the large $Δ$ regime. We find that, when $0<r<1$, the low-frequency conductivity assumes an anomalous form $σ(ω)\approx a ω^2 + b Δ^{-2} $. In particular, when $Δ\to\infty$ the model becomes dynamically constrained and most states are localized. We show, microscopically, existence of magnon bound states in the strong coupling regime, which behave as self-generated disorders for single magnons. Based on this quasiparticle picture, we obtain analytical scalings, which match well with the numerical results. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_19873 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Infinite temperature transport in the strong coupling regime of a nonintegrable quantum spin chain Li, Zhi-Hua Strongly Correlated Electrons We study spin transport of the XXZ model with next-nearest neighbor $Δ_2$ terms. We compute numerically dependence of spin conductivity $σ(ω)$ on the anisotropy $Δ$ and the ratio $r= Δ_2/Δ$, in the large $Δ$ regime. We find that, when $0<r<1$, the low-frequency conductivity assumes an anomalous form $σ(ω)\approx a ω^2 + b Δ^{-2} $. In particular, when $Δ\to\infty$ the model becomes dynamically constrained and most states are localized. We show, microscopically, existence of magnon bound states in the strong coupling regime, which behave as self-generated disorders for single magnons. Based on this quasiparticle picture, we obtain analytical scalings, which match well with the numerical results. |
| title | Infinite temperature transport in the strong coupling regime of a nonintegrable quantum spin chain |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.19873 |