292 citations · 1.5k across the 86 of their papers we have counts for
24 papers · 1 filter
Skyrmion gears: translation-to-rotation conversion of skyrmion clusters along periodic substrates
N. P. Vizarim, C. J. O. Reichhardt, C. Reichhardt
We investigate how the translational motion of a compact skyrmion cluster can be converted into collective rotation through interactions with a periodic obstacle substrate. Using a…
Ratchet Effects in Cyclic Pattern Formation Systems with Competing Interactions
C. Reichhardt, C. J. O. Reichhardt
Ratchet effects can appear for particles interacting with an asymmetric potential under ac driving or for a thermal system in which a substrate is periodically flashed. Here, we sh…
Turbulence to order transitions in activity patterned active nematics
Cody D. Schimming, C. J. O. Reichhardt, C. Reichhardt
We numerically study two-dimensional active nematics with periodic activity patterning. For stripes of activity, we observe a transition from two-dimensional to one-dimensional act…
Active Nematic Ratchet in Asymmetric Obstacle Arrays
Cody D. Schimming, C. J. O. Reichhardt, C. Reichhardt
We numerically investigate the effect of a periodic array of asymmetric obstacles in a two-dimensional active nematic. We find that activity in conjunction with the asymmetry leads…
Sliding Dynamics for Bubble Phases on Periodic Modulated Substrates
C. Reichhardt, C. J. O. Reichhardt
We analyze a bubble forming system composed of particles with competing long range repulsive and short range attractive interactions driven over a quasi-one-dimensional periodic su…
Vortex Lattices in Active Nematics with Periodic Obstacle Arrays
Cody D. Schimming, C. J. O. Reichhardt, C. Reichhardt
We numerically model a two-dimensional active nematic confined by a periodic array of fixed obstacles. Even in the passive nematic, the appearance of topological defects is unavoid…
Friction mediated phase transition in confined active nematics
Cody D. Schimming, C. J. O. Reichhardt, C. Reichhardt
Using a minimal continuum model, we investigate the interplay between circular confinement and substrate friction in active nematics. Upon increasing the friction from low to high,…
Transition from Susceptible-Infected to Susceptible-Infected-Recovered Dynamics in a Susceptible-Cleric-Zombie-Recovered Active Matter Model
A. Libal, P. Forgacs, A. Neda +3
The Susceptible-Infected (SI) and Susceptible-Infected-Recovered (SIR) models provide two distinct representations of epidemic evolution, distinguished by the lack of spontaneous r…
Pattern Formation and Flocking for Particles Near the Jamming Transition on Resource Gradient Substrates
L. Varga, A. Libal, C. Reichhardt +1
We numerically examine a bidisperse system of active and passive particles coupled to a resource substrate. The active particles deplete the resource at a fixed rate and move towar…
Using Active Matter to Introduce Spatial Heterogeneity to the Susceptible-Infected-Recovered Model of Epidemic Spreading
P. Forgacs, A. Libal, C. Reichhardt +2
The widely used susceptible-infected-recovered (S-I-R) epidemic model assumes a uniform, well-mixed population, and incorporation of spatial heterogeneities remains a major challen…
Reversible to Irreversible Transitions for Cyclically Driven Disks on Periodic Obstacle Arrays
C. Reichhardt, C. J. O. Reichhardt
We examine the collective dynamics of disks moving through a square array of obstacles under cyclic square wave driving. Below a critical density we find that system organizes into…
Active Rheology and Anti-Commensuration Effects For Driven Probe Particles on Two Dimensional Periodic Pinning Substrates
C. J. O. Reichhardt, C. Reichhardt
For an assembly of particles interacting with a two dimensional periodic substrate, a series of commensuration effects can arise when the number of particles is an integer multiple…
Active Phases for Particles on Resource Landscapes
L. Varga, A. Libal, C. J. O. Reichhardt +1
We introduce an active matter model composed of sterically interacting particles which absorb resources from a substrate and move in response to resource gradients. For varied rati…
Active Matter Shepherding and Clustering in Inhomogeneous Environments
P. Forgacs, A. Libal, C. Reichhardt +1
We consider a mixture of active and passive run-and-tumble disks in an inhomogeneous environment where only half of the sample contains quenched disorder or pinning. The disks are…
Clogging, Dynamics and Reentrant Fluid for Active Matter on Periodic Substrates
C. Reichhardt, C. J. O. Reichhardt
We examine the collective states of run-and-tumble active matter disks driven over a periodic obstacle array. When the drive is applied along a symmetry direction of the array, we…
Active Matter Commensuration and Frustration Effects on Periodic Substrates
C. Reichhardt, C. J. O. Reichhardt
We show that self-driven particles coupled to a periodic obstacle array exhibit novel active matter commensuration effects that are absent in the Brownian limit. As the obstacle si…
Directional Locking Effects for Active Matter Particles Coupled to a Periodic Substrate
C. Reichhardt, C. J. O. Reichhardt
Directional locking occurs when a particle moving over a periodic substrate becomes constrained to travel along certain substrate symmetry directions. Such locking effects arise fo…
Collective Effects and Pattern Formation for Directional Locking of Disks Moving Through Obstacle Arrays
C. Reichhardt, C. J. O. Reichhardt
We examine directional locking effects in an assembly of disks driven through a square array of obstacles as the angle of drive rotates from zero to ninety degrees. For increasing…
Colloidal Dynamics on a Choreographic Time Crystal
Andras Libal, Tunde Balazs, C. Reichhardt +1
A choreographic time crystal is a dynamic lattice structure in which the points comprising the lattice move in a coordinated fashion. These structures were initially proposed for u…
Noise spectra in the reversible-irreversible transition in amorphous solids under oscillatory driving
Ido Regev, C. Reichhardt, C. J. O. Reichhardt
We study the stress fluctuations in simulations of a two-dimensional amorphous solid under a cyclic drive. It is known that this system organizes into a reversible state for small…
Clogging and Depinning of Ballistic Active Matter Systems in Disordered Media
C. Reichhardt, C. J. O. Reichhardt
We numerically examine ballistic active disks driven through a random obstacle array. Formation of a pinned or clogged state occurs at much lower obstacle densities for the active…
Avalanche Dynamics for Active Matter in Heterogeneous Media
C. J. O. Reichhardt, C. Reichhardt
Using numerical simulations, we examine the dynamics of active matter run-and-tumble disks moving in a disordered array of obstacles. As a function of increasing active disk densit…
Negative Differential Mobility and Trapping in Active Matter Systems
C. Reichhardt, C. J. O. Reichhardt
Using simulations, we examine the average velocity as a function of applied drift force for active matter particles moving through a random obstacle array. We find that for low dri…
Active Matter Transport and Jamming on Disordered Landscapes
C. Reichhardt, C. J. Olson Reichhardt
We numerically examine the transport of active run-and-tumble particles driven with a drift force over random disordered landscapes comprised of fixed obstacles. For increasing run…