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Title: Avalanche dynamics for active matter in heterogeneous media

Abstract

Using numerical simulations, we examine the dynamics of run-and-tumble disks moving in a disordered array of fixed obstacles. As a function of increasing active disk density and activity, we find a transition from a completely clogged state to a continuous flowing phase, and in the large activity limit, we observe an intermittent state where the motion occurs in avalanches that are power law distributed in size with an exponent of $$\beta =1.46$$. In contrast, in the thermal or low activity limit we find bursts of motion that are not broadly distributed in size. We argue that in the highly active regime, the system reaches a self-jamming state due to the activity-induced self-clustering, and that the intermittent dynamics is similar to that found in the yielding of amorphous solids. Our results show that activity is another route by which particulate systems can be tuned to a nonequilibrium critical state.

Authors:
ORCiD logo;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1437808
Alternate Identifier(s):
OSTI ID: 1430008
Report Number(s):
LA-UR-17-28410
Journal ID: ISSN 1367-2630
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 20 Journal Issue: 2; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Material Science

Citation Formats

Reichhardt, C. J. O., and Reichhardt, C. Avalanche dynamics for active matter in heterogeneous media. United Kingdom: N. p., 2018. Web. doi:10.1088/1367-2630/aaa392.
Reichhardt, C. J. O., & Reichhardt, C. Avalanche dynamics for active matter in heterogeneous media. United Kingdom. https://doi.org/10.1088/1367-2630/aaa392
Reichhardt, C. J. O., and Reichhardt, C. Thu . "Avalanche dynamics for active matter in heterogeneous media". United Kingdom. https://doi.org/10.1088/1367-2630/aaa392.
@article{osti_1437808,
title = {Avalanche dynamics for active matter in heterogeneous media},
author = {Reichhardt, C. J. O. and Reichhardt, C.},
abstractNote = {Using numerical simulations, we examine the dynamics of run-and-tumble disks moving in a disordered array of fixed obstacles. As a function of increasing active disk density and activity, we find a transition from a completely clogged state to a continuous flowing phase, and in the large activity limit, we observe an intermittent state where the motion occurs in avalanches that are power law distributed in size with an exponent of $\beta =1.46$. In contrast, in the thermal or low activity limit we find bursts of motion that are not broadly distributed in size. We argue that in the highly active regime, the system reaches a self-jamming state due to the activity-induced self-clustering, and that the intermittent dynamics is similar to that found in the yielding of amorphous solids. Our results show that activity is another route by which particulate systems can be tuned to a nonequilibrium critical state.},
doi = {10.1088/1367-2630/aaa392},
journal = {New Journal of Physics},
number = 2,
volume = 20,
place = {United Kingdom},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/1367-2630/aaa392

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Cited by: 5 works
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Works referencing / citing this record:

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