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• W2090829235 abstract "The maximum Lyapunov exponent (MLE) is evaluated as a function of temperature in the isotropic Heisenberg chain. At low temperatures the MLE varies almost quadratically with temperature; it corresponds closely with ${mathrm{ensuremath{tau}}}_{1mathrm{/}2}^{mathrm{ensuremath{-}}1}$, the rate at which the local self-correlation decays to half its initial value. At higher temperatures, the MLE saturates at a value close to 1/2 in the limit of large chain lengths. The strong stochasticity threshold (defined by the change of slope of the MLE) parallels closely the transition from predominantly ballistic to predominantly diffusive behavior of the self-correlation and the concomitant steep increase in ${mathrm{ensuremath{tau}}}_{1mathrm{/}2}^{mathrm{ensuremath{-}}1}$. The complete Lyapunov spectrum has been derived for a chain of 18 spins; deviations from linearity occurring at infinite temperature suggest that the chaoticity of the system is incomplete. Finally, it is suggested that a systematic study of finite-size effects might be useful in deciding the issue of anomalous versus conventional spin diffusion." @default.
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• W2090829235 date "1997-06-01" @default.
• W2090829235 modified "2023-10-02" @default.
• W2090829235 title "Nonlinear dynamics of classical Heisenberg chains" @default.
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• W2090829235 doi "https://doi.org/10.1103/physreve.55.7612" @default.
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