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arXiv 2403.06175cond-mat.dis-nncond-mat.soft
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通过构型模式匹配识别的玻璃态弛豫的普适起源

Universal Origin of Glassy Relaxation as Recognized by Configuration Pattern-matching

Hai-Bin Yu, Liang Gao, Jia-Qi Gao, Konrad Samwer

AI总结:

本研究针对不同材料中玻璃态弛豫的支配原理不明问题,提出将全局构型视为单一实体,引入固有结构最小位移序参量,通过原子模拟发现机械阻尼因子与该序参量的标度律,揭示了玻璃态弛豫的普适起源。

摘要:

弛豫过程对于理解液体和非晶材料的结构重排至关重要。然而,支配这些过程在截然不同的材料中发生的总体原理仍是一个悬而未决的问题。此前已有大量基于单个粒子运动的分析。在此,我们另辟蹊径,提出将全局构型视为一个单一实体。我们引入一个全局序参量,即固有结构最小位移(IS Dmin),通过模式匹配技术来量化构型的可变性。通过对七种模型玻璃形成液体的原子模拟,我们借助机械阻尼因子与IS Dmin之间的标度律,统一了温度、压力和扰动时间对弛豫耗散的影响。从根本上说,这一标度反映了局域势能面的曲率。我们的发现揭示了玻璃态弛豫的一个普适起源,并为研究无序系统提供了一种替代方法。

英文摘要:

Relaxation processes are crucial in understanding the structural rearrangements of liquids and amorphous materials. However, the overarching principle that governs these processes across vastly different materials remains an open question. Substantial analysis has been carried out based on the motions of individual particles. Here, alternatively, we propose viewing the global configuration as a single entity. We introduce a global order parameter, namely the inherent structure minimal displacement (IS Dmin), to quantify the variability of configurations by a pattern-matching technique. Through atomic simulations of seven model glass-forming liquids, we unify the influences of temperature, pressure, and perturbation time on the relaxation dissipation, via a scaling law between the mechanical damping factor and IS Dmin. Fundamentally, this scaling reflects the curvature of the local potential energy landscape. Our findings uncover a universal origin of glassy relaxation and offer an alternative approach to studying disordered systems.

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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