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 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.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1477663
- Alternate ID(s):
- OSTI ID: 1463210
- Report Number(s):
- LA-UR-18-24223; PLEEE8
- Journal Information:
- Physical Review E, Vol. 98, Issue 2; ISSN 2470-0045
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Reversibility, pattern formation, and edge transport in active chiral and passive disk mixtures
|
journal | February 2019 |
Traveling band formation in feedback-driven colloids
|
journal | August 2019 |
| Disordering, Clustering, and Laning Transitions in Particle Systems with Dispersion in the Magnus Term | text | January 2018 |
| Reversibility, Pattern Formation and Edge Transport in Active Chiral and Passive Disk Mixtures | text | January 2018 |
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