Continuum Theory of Phase Separation Kinetics for Active Brownian Particles

被引：331

作者：

Stenhammar, Joakim ^{[1
]}

Tiribocchi, Adriano ^{[1
]}

Allen, Rosalind J. ^{[1
]}

Marenduzzo, Davide ^{[1
]}

Cates, Michael E. ^{[1
]}

机构：

[1] Univ Edinburgh, Sch Phys & Astron, SUPA, Edinburgh EH9 3JZ, Midlothian, Scotland

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 14期

基金：

英国工程与自然科学研究理事会; 瑞典研究理事会;

关键词：

FLUCTUATIONS;

D O I：

10.1103/PhysRevLett.111.145702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Active Brownian particles (ABPs), when subject to purely repulsive interactions, are known to undergo activity-induced phase separation broadly resembling an equilibrium (attraction-induced) gas-liquid coexistence. Here we present an accurate continuum theory for the dynamics of phase-separating ABPs, derived by direct coarse graining, capturing leading-order density gradient terms alongside an effective bulk free energy. Such gradient terms do not obey detailed balance; yet we find coarsening dynamics closely resembling that of equilibrium phase separation. Our continuum theory is numerically compared to large-scale direct simulations of ABPs and accurately accounts for domain growth kinetics, domain topologies, and coexistence densities.

引用

页数：5

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