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arXiv 2310.12295cond-mat.stat-mech
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非可积性驱动的从动力学到流体动力学的转变

Nonintegrability-driven Transition from Kinetics to Hydrodynamics

Weicheng Fu, Zhen Wang, Yisen Wang, Yong Zhang, Hong Zhao

AI总结:

本文以一维双原子硬点模型为例,研究了非可积性对多体哈密顿系统热化与输运的影响,发现随非可积性强度增加,系统从动力学行为转变为流体动力学行为,并给出了转变阈值及热导率显式表达式。

摘要:

非可积性在多体哈密顿系统的热化和输运过程中起着关键作用,但其定量效应仍不清楚。为了揭示宏观弛豫性质与底层动力学之间的联系,以一维双原子硬点模型为例进行了分析和数值研究。我们展示了随着非可积性强度增加,系统如何从动力学行为转变为流体动力学行为。具体而言,对于热化动力学,我们发现在近可积区域,热化时间与微扰强度之间呈幂律关系;而在远离可积区域,流体动力学占主导地位,热化时间变得与微扰强度无关,并表现出强烈的尺寸依赖行为。关于输运行为,我们的结果进一步确定了这一转变的非可积强度阈值。因此,我们能够预测哪种行为主导系统的输运性质。特别地,给出了由动力学贡献的热导率的显式表达式。最后,简要讨论了可能的应用。

英文摘要:

Nonintegrability plays a crucial role in thermalization and transport processes in many-body Hamiltonian systems, yet its quantitative effects remain unclear. To reveal the connection between the macroscopic relaxation properties and the underlying dynamics, the one-dimensional diatomic hard-point model as an illustrating example was studied analytically and numerically. We demonstrate how the system transitions from kinetic behavior to hydrodynamic behavior as the nonintegrability strength increases. Specifically, for the thermalization dynamics, we find a power-law relationship between the thermalization time and the perturbation strength near integrable regime, whereas in the far from integrable regime, the hydrodynamics dominates and the thermalization time becomes independent of the perturbation strength and exhibits a strong size-dependent behavior. Regarding transport behavior, our results further establish a threshold for the nonintegrable strength of this transition. Consequently, we can predict which behavior dominates the transport properties of the system. Especially, an explicit expression of the thermal conductivity contributed by the kinetics is given. Finally, possible applications were briefly discussed.

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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