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Title: Negative differential mobility and trapping in active matter systems

Abstract

Using simulations, we explore the average velocity as a function of applied drift force for active matter particles moving through a random obstacle array. We find that for low drift force, there is an initial flow regime where the mobility increases linearly with drive, while for higher drift forces a regime of negative differential mobility appears in which the velocity decreases with increasing drive due to the trapping of active particles behind obstacles. A fully clogged regime exists at very high drift forces when all the particles are permanently trapped behind obstacles. We discover for increasing activity that the overall mobility is nonmonotonic, with an enhancement of the mobility for small levels of activity and a decrease in mobility for large activity levels. We show how these effects evolve as a function of disk and obstacle density, active run length, drift force, and motor force.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1523233
Report Number(s):
LA-UR-17-28263
Journal ID: ISSN 0953-8984
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 30; Journal Issue: 1; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
Material Science

Citation Formats

Reichhardt, Charles, and Reichhardt, Cynthia Jane O. Negative differential mobility and trapping in active matter systems. United States: N. p., 2017. Web. doi:10.1088/1361-648X/aa9c5f.
Reichhardt, Charles, & Reichhardt, Cynthia Jane O. Negative differential mobility and trapping in active matter systems. United States. doi:10.1088/1361-648X/aa9c5f.
Reichhardt, Charles, and Reichhardt, Cynthia Jane O. Wed . "Negative differential mobility and trapping in active matter systems". United States. doi:10.1088/1361-648X/aa9c5f. https://www.osti.gov/servlets/purl/1523233.
@article{osti_1523233,
title = {Negative differential mobility and trapping in active matter systems},
author = {Reichhardt, Charles and Reichhardt, Cynthia Jane O.},
abstractNote = {Using simulations, we explore the average velocity as a function of applied drift force for active matter particles moving through a random obstacle array. We find that for low drift force, there is an initial flow regime where the mobility increases linearly with drive, while for higher drift forces a regime of negative differential mobility appears in which the velocity decreases with increasing drive due to the trapping of active particles behind obstacles. A fully clogged regime exists at very high drift forces when all the particles are permanently trapped behind obstacles. We discover for increasing activity that the overall mobility is nonmonotonic, with an enhancement of the mobility for small levels of activity and a decrease in mobility for large activity levels. We show how these effects evolve as a function of disk and obstacle density, active run length, drift force, and motor force.},
doi = {10.1088/1361-648X/aa9c5f},
journal = {Journal of Physics. Condensed Matter},
number = 1,
volume = 30,
place = {United States},
year = {2017},
month = {12}
}

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