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Title: Laning and clustering transitions in driven binary active matter systems

It is well known that a binary system of nonactive disks that experience driving in opposite directions exhibits jammed, phase separated, disordered, and laning states. In active matter systems, such as a crowd of pedestrians, driving in opposite directions is common and relevant, especially in conditions which are characterized by high pedestrian density and emergency. In such cases, the transition from laning to disordered states may be associated with the onset of a panic state. In this study, we simulate a laning system containing active disks that obey run-and-tumble dynamics, and we measure the drift mobility and structure as a function of run length, disk density, and drift force. The activity of each disk can be quantified based on the correlation timescale of the velocity vector. We find that in some cases, increasing the activity can increase the system mobility by breaking up jammed configurations; however, an activity level that is too high can reduce the mobility by increasing the probability of disk-disk collisions. In the laning state, the increase of activity induces a sharp transition to a disordered strongly fluctuating state with reduced mobility. We identify a novel drive-induced clustered laning state that remains stable even at densities belowmore » the activity-induced clustering transition of the undriven system. Lastly, we map out the dynamic phase diagrams highlighting transitions between the different phases as a function of activity, drive, and density.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); West Virginia Univ., Morgantown, WV (United States)
  3. West Virginia Univ., Morgantown, WV (United States)
Publication Date:
Report Number(s):
LA-UR-18-24223
Journal ID: ISSN 2470-0045; PLEEE8
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 98; Journal Issue: 2; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
OSTI Identifier:
1477663
Alternate Identifier(s):
OSTI ID: 1463210

Reichhardt, Charles, Thibault, Joshua, Stefanos, Papanikolaou, and Reichhardt, Cynthia Jane. Laning and clustering transitions in driven binary active matter systems. United States: N. p., Web. doi:10.1103/PhysRevE.98.022603.
Reichhardt, Charles, Thibault, Joshua, Stefanos, Papanikolaou, & Reichhardt, Cynthia Jane. Laning and clustering transitions in driven binary active matter systems. United States. doi:10.1103/PhysRevE.98.022603.
Reichhardt, Charles, Thibault, Joshua, Stefanos, Papanikolaou, and Reichhardt, Cynthia Jane. 2018. "Laning and clustering transitions in driven binary active matter systems". United States. doi:10.1103/PhysRevE.98.022603.
@article{osti_1477663,
title = {Laning and clustering transitions in driven binary active matter systems},
author = {Reichhardt, Charles and Thibault, Joshua and Stefanos, Papanikolaou and Reichhardt, Cynthia Jane},
abstractNote = {It is well known that a binary system of nonactive disks that experience driving in opposite directions exhibits jammed, phase separated, disordered, and laning states. In active matter systems, such as a crowd of pedestrians, driving in opposite directions is common and relevant, especially in conditions which are characterized by high pedestrian density and emergency. In such cases, the transition from laning to disordered states may be associated with the onset of a panic state. In this study, we simulate a laning system containing active disks that obey run-and-tumble dynamics, and we measure the drift mobility and structure as a function of run length, disk density, and drift force. The activity of each disk can be quantified based on the correlation timescale of the velocity vector. We find that in some cases, increasing the activity can increase the system mobility by breaking up jammed configurations; however, an activity level that is too high can reduce the mobility by increasing the probability of disk-disk collisions. In the laning state, the increase of activity induces a sharp transition to a disordered strongly fluctuating state with reduced mobility. We identify a novel drive-induced clustered laning state that remains stable even at densities below the activity-induced clustering transition of the undriven system. Lastly, we map out the dynamic phase diagrams highlighting transitions between the different phases as a function of activity, drive, and density.},
doi = {10.1103/PhysRevE.98.022603},
journal = {Physical Review E},
number = 2,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}