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Title: Velocity force curves, laning, and jamming for oppositely driven disk systems

Abstract

Using simulations we examine here a two-dimensional disk system in which two disk species are driven in opposite directions. We measure the average velocity of one of the species versus the applied driving force and identify four phases as function of drive and disk density: a jammed state, a completely phase separated state, a continuously mixing phase, and a laning phase. The transitions between these phases are correlated with jumps in the velocity–force curves that are similar to the behavior observed at dynamical phase transitions in driven particle systems with quenched disorder such as vortices in type-II superconductors. In some cases the transitions between phases are associated with negative differential mobility in which the average absolute velocity of either species decreases with increasing drive. We also consider the situation where the drive is applied to only one species as well as systems in which both species are driven in the same direction with different drive amplitudes. We show that the phases are robust against the addition of thermal fluctuations. Finally, we discuss how the transitions we observe could be related to absorbing phase transitions where a system in a phase separated or laning regime organizes to a state in whichmore » contacts between the disks no longer occur and dynamical fluctuations are lost.« less

Authors:
ORCiD logo [1];  [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:
1514963
Report Number(s):
LA-UR-17-26542
Journal ID: ISSN 1744-683X
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 14; Journal Issue: 4; Journal ID: ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English

Citation Formats

Reichhardt, C., and Reichhardt, C. J. O. Velocity force curves, laning, and jamming for oppositely driven disk systems. United States: N. p., 2017. Web. doi:10.1039/C7SM02162C.
Reichhardt, C., & Reichhardt, C. J. O. Velocity force curves, laning, and jamming for oppositely driven disk systems. United States. doi:10.1039/C7SM02162C.
Reichhardt, C., and Reichhardt, C. J. O. Fri . "Velocity force curves, laning, and jamming for oppositely driven disk systems". United States. doi:10.1039/C7SM02162C. https://www.osti.gov/servlets/purl/1514963.
@article{osti_1514963,
title = {Velocity force curves, laning, and jamming for oppositely driven disk systems},
author = {Reichhardt, C. and Reichhardt, C. J. O.},
abstractNote = {Using simulations we examine here a two-dimensional disk system in which two disk species are driven in opposite directions. We measure the average velocity of one of the species versus the applied driving force and identify four phases as function of drive and disk density: a jammed state, a completely phase separated state, a continuously mixing phase, and a laning phase. The transitions between these phases are correlated with jumps in the velocity–force curves that are similar to the behavior observed at dynamical phase transitions in driven particle systems with quenched disorder such as vortices in type-II superconductors. In some cases the transitions between phases are associated with negative differential mobility in which the average absolute velocity of either species decreases with increasing drive. We also consider the situation where the drive is applied to only one species as well as systems in which both species are driven in the same direction with different drive amplitudes. We show that the phases are robust against the addition of thermal fluctuations. Finally, we discuss how the transitions we observe could be related to absorbing phase transitions where a system in a phase separated or laning regime organizes to a state in which contacts between the disks no longer occur and dynamical fluctuations are lost.},
doi = {10.1039/C7SM02162C},
journal = {Soft Matter},
number = 4,
volume = 14,
place = {United States},
year = {2017},
month = {12}
}

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