Lengthscale dependence of dynamic four-point susceptibilities in glass formers

被引：81

作者：

Chandler, David ^{[1
]}

Garrahan, Juan P.

Jack, Robert L.

Maibaum, Lutz

Pan, Albert C.

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

来源：

PHYSICAL REVIEW E | 2006年 / 74卷 / 05期

基金：

美国国家科学基金会;

关键词：

SPATIALLY HETEROGENEOUS DYNAMICS; MODE-COUPLING THEORY; MOLECULAR-DYNAMICS; LIQUIDS; SCALE; FLUCTUATIONS; DIFFUSION; MOTION;

D O I：

10.1103/PhysRevE.74.051501

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Dynamical four-point susceptibilities measure the extent of spatial correlations in the dynamics of glass forming systems. We show how these susceptibilities depend on the lengthscales that necessarily form part of their definition. The behavior of these susceptibilities is estimated by means of an analysis in terms of renewal processes within the context of dynamic facilitation. The analytic results are confirmed by numerical simulations of an atomistic model glass former, and of two kinetically constrained models. Hence we argue that the scenario predicted by the dynamic facilitation approach is generic.

引用

页数：9

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