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arXiv 2005.03478cond-mat.stat-mechcond-mat.dis-nnnlin.CD
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二维和三维经典晶格的热化

Thermalization of two- and three-dimensional classical lattices

Zhen Wang, Weicheng Fu, Yong Zhang, Hong Zhao

AI总结:

本研究通过解析与数值方法,揭示二维和三维经典晶格中能量弛豫的普适时间尺度,表明能量均分在足够大的晶格中普遍达成,并有助于探索固体材料中的高阶非线性效应。

摘要:

系统是否以及如何达到热化是统计物理学的一个基本问题。对于一维晶格,这个问题在能量均分方面已被深入研究超过半个世纪,但在二维和三维晶格的情况下却鲜有研究,因此对于更现实的晶格,热化动力学仍不清楚。在本信中,我们从解析和数值上研究了这些晶格中能量弛豫的时间尺度。我们表明,对于足够大的晶格,能量均分通常遵循一个普适方案达到,无论其维度、具体晶格结构如何,也不论系统是否具有平移不变性。我们的结果在探索固体材料中高阶非线性效应(即多声子过程的组合效应)方面具有实际意义。

英文摘要:

Whether and how a system reaches thermalization is a fundamental issue of statistical physics. While for one-dimensional lattices this issue has been intensively studied in terms of energy equipartition for more than half a century, few work has been performed in the case of two- and three-dimensional lattices, and thus the thermalization dynamics remains unclear for more realistic lattices. In this Letter we investigate analytically and numerically the time-scaling of energy relaxation in these lattices. We show that the equipartition of energy is generally reached following a universal scheme for large enough lattices, regardless of its dimensionality, its specific lattice structure, and whether the system is translation invariant or not. Our results have practical significance in exploring the effect of high-order nonlinearities, i.e., the combining effect of multi-phonon process, in solid materials.

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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