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Title: Phase separation and large deviations of lattice active matter

Abstract

Off-lattice active Brownian particles form clusters and undergo phase separation even in the absence of attractions or velocity-alignment mechanisms. Arguments that explain this phenomenon appeal only to the ability of particles to move persistently in a direction that fluctuates, but existing lattice models of hard particles that account for this behavior do not exhibit phase separation. Here we present a lattice model of active matter that exhibits motility-induced phase separation in the absence of velocity alignment. Using direct and rare-event sampling of dynamical trajectories, we show that clustering and phase separation are accompanied by pronounced fluctuations of static and dynamic order parameters. In conclusion, this model provides a complement to off-lattice models for the study of motility-induced phase separation.

Authors:
 [1]; ORCiD logo [2];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1462977
Alternate Identifier(s):
OSTI ID: 1434178
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 148; Journal Issue: 15; Related Information: © 2018 Author(s).; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Whitelam, Stephen, Klymko, Katherine, and Mandal, Dibyendu. Phase separation and large deviations of lattice active matter. United States: N. p., 2018. Web. doi:10.1063/1.5023403.
Whitelam, Stephen, Klymko, Katherine, & Mandal, Dibyendu. Phase separation and large deviations of lattice active matter. United States. doi:https://doi.org/10.1063/1.5023403
Whitelam, Stephen, Klymko, Katherine, and Mandal, Dibyendu. Fri . "Phase separation and large deviations of lattice active matter". United States. doi:https://doi.org/10.1063/1.5023403. https://www.osti.gov/servlets/purl/1462977.
@article{osti_1462977,
title = {Phase separation and large deviations of lattice active matter},
author = {Whitelam, Stephen and Klymko, Katherine and Mandal, Dibyendu},
abstractNote = {Off-lattice active Brownian particles form clusters and undergo phase separation even in the absence of attractions or velocity-alignment mechanisms. Arguments that explain this phenomenon appeal only to the ability of particles to move persistently in a direction that fluctuates, but existing lattice models of hard particles that account for this behavior do not exhibit phase separation. Here we present a lattice model of active matter that exhibits motility-induced phase separation in the absence of velocity alignment. Using direct and rare-event sampling of dynamical trajectories, we show that clustering and phase separation are accompanied by pronounced fluctuations of static and dynamic order parameters. In conclusion, this model provides a complement to off-lattice models for the study of motility-induced phase separation.},
doi = {10.1063/1.5023403},
journal = {Journal of Chemical Physics},
number = 15,
volume = 148,
place = {United States},
year = {2018},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
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Citation Metrics:
Cited by: 9 works
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Figures / Tables:

FIG. 1. FIG. 1.: (a) Rates for the motion of isolated lattice-based active particles (particles may not move to an occupied site), and the color scheme used in pictures: particles that point toward nearest-neighbor particles are shown in red, and those that do not are shown in blue. (b) Time-ordered configurations formore » density $\phi$ = 1/5 and $v_+$ = 25, showing motility-induced phase separation. Lattice size is 2002.« less

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