Avalanche dynamics for active matter in heterogeneous media

doi:10.1088/1367-2630/aaa392

Title: Avalanche dynamics for active matter in heterogeneous media

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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:

; Reichhardt, C.

Publication Date:: 2018-02-01

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.

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                    Reichhardt, C. J. O., & Reichhardt, C. Avalanche dynamics for active matter in heterogeneous media.  United Kingdom.  doi:10.1088/1367-2630/aaa392.

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                    Reichhardt, C. J. O., and Reichhardt, C. Thu .  
        "Avalanche dynamics for active matter in heterogeneous media".  United Kingdom.  doi:10.1088/1367-2630/aaa392.

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@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}

}

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