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arXiv 2103.07211cond-mat.softcond-mat.dis-nn
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再论过冷液体中的活化概念

Revisiting the Concept of Activation in Supercooled Liquids

Marco Baity-Jesi, Giulio Biroli, David R. Reichman

摘要:

在这项工作中,我们重新审视描述的动力学的基础上的概念的metabasins和激活在轻度过冷液体通过分析的动力学之间的一个典范的玻璃前体的起始温度$T_{o}$和模式耦合温度$T_{c}$。首先,我们提供的措施,证明了发病的glassiness确实是连接到景观,和metabasin等待时间分布是如此广泛,系统可以保持停留在metabasin的时间超过$τ_α$的数量级。然后,我们重新分析之间的过渡元基,提供了几个迹象表明,标准的图片激活动态的陷阱不举行在这个政权。相反,我们建议,在这里激活主要是由熵,而不是充满活力的障碍。特别是,我们说明,激活是不控制的跳跃高能量的障碍,应该更恰当地解释为熵选择的近barrierless,但罕见的途径连接的景观上的变基。

英文摘要:

In this work we revisit the description of dynamics based on the concepts of metabasins and activation in mildly supercooled liquids via the analysis of the dynamics of a paradigmatic glass former between its onset temperature $T_{o}$ and mode-coupling temperature $T_{c}$. First, we provide measures that demonstrate that the onset of glassiness is indeed connected to the landscape, and that metabasin waiting time distributions are so broad that the system can remain stuck in a metabasin for times that exceed $τ_α$ by orders of magnitude. We then reanalyze the transitions between metabasins, providing several indications that the standard picture of activated dynamics in terms of traps does not hold in this regime. Instead, we propose that here activation is principally driven by entropic instead of energetic barriers. In particular, we illustrate that activation is not controlled by the hopping of high energetic barriers, and should more properly be interpreted as the entropic selection of nearly barrierless but rare pathways connecting metabasins on the landscape.

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