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arXiv 2211.08009cond-mat.stat-mech
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非平衡相变到均场自旋模型中的时间振荡

Nonequilibrium Phase Transition To Temporal Oscillations In Mean-Field Spin Models

Univ. Grenoble Alpes, CNRS, LIPhy(格勒诺布尔阿尔卑斯大学,法国国家科学研究中心,LIPhy)

Laura Guislain, Eric Bertin

AI总结:

本文提出了一种均场理论,用于研究自旋模型中非平衡相变到周期性振荡状态的机制,并通过显式动力学模型展示了其特性。

摘要:

我们提出了一种均场理论,用于非平衡相变到自旋模型中周期性振荡状态。通过磁化量及其平滑的随机时间导数的联合分布,得到了非平衡情况下的Landau自由能泛化。相变的序参量是哈密顿量,其非零值表明振荡的开始。哈密顿量和非平衡Landau自由能从随机自旋动力学中明确确定。振荡相也由非平凡的重叠分布特征化,尽管没有无序。通过一个显式的动力学均场自旋模型进行了说明。

英文摘要:

We propose a mean-field theory for nonequilibrium phase transitions to a periodically oscillating state in spin models. A nonequilibrium generalization of the Landau free energy is obtained from the join distribution of the magnetization and its smoothed stochastic time derivative. The order parameter of the transition is a Hamiltonian, whose nonzero value signals the onset of oscillations. The Hamiltonian and the nonequilibrium Landau free energy are determined explicitly from the stochastic spin dynamics. The oscillating phase is also characterized by a non-trivial overlap distribution reminiscent of a continuous replica symmetry breaking, in spite of the absence of disorder. An illustration is given on an explicit kinetic mean-field spin model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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