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Motility-induced phase separation is reentrant

Physics

Motility-induced phase separation is reentrant

J. Su, M. Feng, et al.

Discover the intriguing phenomenon of reentrant motility-induced phase separation in active Brownian particles with pure repulsion, researched by Jie Su, Mengkai Feng, Yunfei Du, Huijun Jiang, and Zhonghuai Hou. This study uncovers how higher activity levels can paradoxically hinder phase separation after initially promoting it, showcasing the fascinating role of nonequilibrium dynamics in active systems.

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Playback language: English
Abstract
Active Brownian particles (ABPs) with pure repulsion can undergo motility-induced phase separation (MIPS). This study reveals a counterintuitive reentrant MIPS, where increasing activity initially promotes phase separation but then hinders it at sufficiently high activity. Theoretical analysis based on a kinetic theory demonstrates that activity-induced nonequilibrium vaporization counteracts the activity-induced effective attraction, leading to the reentrant behavior. Simulations confirm this phenomenon and its dependence on activity and interaction strength, highlighting the unique role of nonequilibrium in active systems.
Publisher
Communications Physics
Published On
Mar 31, 2023
Authors
Jie Su, Mengkai Feng, Yunfei Du, Huijun Jiang, Zhonghuai Hou
Tags
Active Brownian particles
Motility-induced phase separation
Reentrant behavior
Nonequilibrium dynamics
Kinetic theory

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