Swarming bottom feeders: Flocking at solid-liquid interfaces
arXiv:2101.10195 · doi:10.1103/PhysRevLett.127.268004
Abstract
We present the hydrodynamic theory of coherent collective motion ("flocking") at a solid-liquid interface, and many of its predictions for experiment. We find that such systems are stable, and have long-range orientational order, over a wide range of parameters. When stable, these systems exhibit "giant number fluctuations", which grow as the 3/4th power of the mean number. Stable systems also exhibit anomalous rapid diffusion of tagged particles suspended in the passive fluid along any directions in a plane parallel to the solid-liquid interface, whereas the diffusivity along the direction perpendicular to the plane is not anomalous. In the remaining parameter space, the system becomes unstable.
arXiv comment6 pages, 2 figs
References in corpus (24)
- Novel type of phase transition in a system of self-driven particles
- Flocks, herds, and schools: A quantitative theory of flocking
- Emergence of macroscopic directed motion in populations of motile colloids
- Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles
- Long-lived Giant Number Fluctuations in a Swarming Granular Nematic
- Collective motion of self-propelled particles interacting without cohesion
- Rheology of Active-Particle Suspensions
- Generic theory of active polar gels: a paradigm for cytoskeletal dynamics
- Confinement Stabilizes a Bacterial Suspension into a Spiral Vortex
- Fluid Flows Created by Swimming Bacteria Drive Self-Organization in Confined Suspensions
- Active nematics on a substrate: giant number fluctuations and long-time tails
- Clusters, asters and collective oscillations in chemotactic colloids
- Hydrodynamics of self-propelled hard rods
- Fluctuations and Pattern Formation in Self-Propelled Particles
- The Physics of the Vicsek Model
- Synchronization and Collective Dynamics in a Carpet of Microfluidic Rotors
- Clustering and pattern formation in chemorepulsive active colloids
- Sounds and hydrodynamics of polar active fluids
- Active nematic materials with substrate friction
- Synchronization in A Carpet of Hydrodynamically Coupled Rotors with Random Intrinsic Frequency
- The low noise phase of a 2d active nematic
- Dynamics of Gas-Fluidized Granular Rods
- Giant number fluctuations in dry active polar fluids: A shocking analogy with lightning rods
- Hydrodynamic theory of flocking at a solid-liquid interface: long range order and giant number fluctuations