Fractional Stokes-Einstein and Debye-Stokes-Einstein relations in a network-forming liquid

被引：161

作者：

Becker, Stephen R.

Poole, Peter H.

Starr, Francis W.

机构：

[1] Wesleyan Univ, Dept Phys, Middletown, CT 06459 USA

[2] St Francis Xavier Univ, Dept Phys, Antigonish, NS B2G 2W5, Canada

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.97.055901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the breakdown of the Stokes-Einstein (SE) and Debye-Stokes-Einstein (DSE) relations for translational and rotational motion in a prototypical model of a network-forming liquid, the ST2 model of water. We find that the emergence of fractional SE and DSE relations at low temperature is ubiquitous in this system, with exponents that vary little over a range of distinct physical regimes. We also show that the same fractional SE relation is obeyed by both mobile and immobile dynamical heterogeneities of the liquid.

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页数：4

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