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过冷液体中局部有序性与粒子迁移率之间的相关性高度依赖于系统。

Correlation of local order with particle mobility in supercooled liquids is highly system dependent.

作者信息

Hocky Glen M, Coslovich Daniele, Ikeda Atsushi, Reichman David R

机构信息

Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, USA.

CNRS, Laboratoire Charles Coulomb UMR 5221, Montpellier 34095, France and Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, Montpellier 34095, France.

出版信息

Phys Rev Lett. 2014 Oct 10;113(15):157801. doi: 10.1103/PhysRevLett.113.157801. Epub 2014 Oct 7.

Abstract

We investigate the connection between local structure and dynamical heterogeneity in supercooled liquids. Through the study of four different models, we show that the correlation between a particle's mobility and the degree of local order in nearby regions is highly system dependent. Our results suggest that the correlation between local structure and dynamics is weak or absent in systems that conform well to the mean-field picture of glassy dynamics and strong in those that deviate from this paradigm. Finally, we investigate the role of order-agnostic point-to-set correlations and reveal that they provide similar information content to local structure measures, at least in the system where local order is most pronounced.

摘要

我们研究了过冷液体中局部结构与动力学非均匀性之间的联系。通过对四种不同模型的研究,我们表明粒子迁移率与附近区域局部有序程度之间的相关性高度依赖于系统。我们的结果表明,在很好地符合玻璃态动力学平均场图像的系统中,局部结构与动力学之间的相关性较弱或不存在,而在偏离该范式的系统中则很强。最后,我们研究了与序无关的点到集相关性的作用,并揭示它们至少在局部有序最明显的系统中提供了与局部结构测量相似的信息内容。

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