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Title: Reversibility, pattern formation, and edge transport in active chiral and passive disk mixtures

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.5085209 · OSTI ID:1499363

In this study, we numerically examine mixtures of circularly moving and passive disks as a function of density and active orbit radius. For low or intermediate densities and/or small orbit radii, the system can organize into a reversible partially phase separated labyrinth state in which there are no collisions between disks, with the degree of phase separation increasing as the orbit radius increases. As a function of orbit radius, we find a divergence in the number of cycles required to reach a collision-free steady state at a critical radius, while above this radius, the system remains in a fluctuating liquid state. For high densities, the system can organize into a fully phase separated state that is mostly reversible, but collisions at the boundaries between the phases lead to a net transport of disks along the boundary edges in a direction determined by the chirality of the active disk orbits. We map the dynamic phases as a function of density and orbit radii and discuss the results in terms of the reversible-irreversible transition found in other periodically driven non-thermal systems. Finally, we also consider mixtures of circularly driven disks and ac driven disks where the ac drive is either in or out of phase with the circular motion and find a rich variety of pattern forming and reentrant disordered phases.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Laboratory Directed Research and Development (LDRD); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1499363
Report Number(s):
LA-UR--18-31505
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 6 Vol. 150; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Shear Banding, Intermittency, Jamming and Dynamic Phases for Skyrmions in Inhomogeneous Pinning Arrays text January 2019
Dynamics of Magnus Dominated Particle Clusters, Collisions, Pinning and Ratchets text January 2020
Rectification of chiral active particles driven by transversal temperature difference journal May 2019
Chemical Physics of Active Matter journal September 2019
Chiral edge currents for ac-driven skyrmions in confined pinning geometries journal November 2019
Active microrheology, Hall effect, and jamming in chiral fluids journal July 2019
Chiral Edge Currents for ac Driven Skyrmions in Confined Pinning Geometries text January 2019