Trapping and sorting of active matter in a periodic background potential

Ribeiro, H.E.; Ferreira, W. P.; Potiguar, Fabrício Q.

doi:10.1103/physreve.101.032126

Cited by 21 publications

(18 citation statements)

References 29 publications

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“…A growing number of studies have examined active matter systems coupled to a complex environment such as randomly disordered sites [20][21][22][23][24][25][26][27][28][29] or a periodic array of obstacles [24,[30][31][32][33][34][35][36][37][38]. Extensive studies of passive particles on a periodic array of obstacles under diffusion [39][40][41][42][43] or an external drive [44][45][46][47] show that depinning phenomena, sliding phases, and different types of dynamical pattern formation appear when collective effects become important.…”

Section: Introductionmentioning

confidence: 99%

Directional Locking Effects for Active Matter Particles Coupled to a Periodic Substrate

Reichhardt,

Reichhardt

2020

Preprint

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Directional locking occurs when a particle moving over a periodic substrate becomes constrained to travel along certain substrate symmetry directions. Such locking effects arise for colloids and superconducting vortices moving over ordered substrates when the direction of the external drive is varied. Here we study the directional locking of run-and-tumble active matter particles interacting with a periodic array of obstacles. In the absence of an external biasing force, we find that the active particle motion locks to various symmetry directions of the substrate when the run time between tumbles is large. The number of possible locking directions depends on the array density and on the relative sizes of the particles and the obstacles. For a square array of large obstacles, the active particle only locks to the x, y, and 45 • directions, while for smaller obstacles, the number of locking angles increases. Each locking angle satisfies θ = arctan(p/q), where p and q are integers, and the angle of motion can be measured using the ratio of the velocities or the velocity distributions in the x and y directions. When a biasing driving force is applied, the directional locking behavior is affected by the ratio of the self-propulsion force to the biasing force. For large biasing, the behavior resembles that found for directional locking in passive systems. For large obstacles under biased driving, a trapping behavior occurs that is non-monotonic as a function of increasing run length or increasing self-propulsion force, and the trapping diminishes when the run length is sufficiently large.

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Section: Introductionmentioning

confidence: 99%

Directional Locking Effects for Active Matter Particles Coupled to a Periodic Substrate

Reichhardt,

Reichhardt

2020

Preprint

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“…In the present paper we revisit the set up of [3,4] but for active particles as studied before e.g. also in [10][11][12][13][14][15]: how does the current characteristic change as a function of the persistence?Active matter consists of self-propelled particles, characterized by a coupling between motion and an internal degree of freedom, quantified by persistence [16][17][18][19][20]. Their dynamics model bacteria-motion and nanomotors or active colloids for their locomotion, possibly showing collective effects such as flocking or phase separation [21][22][23][24][25][26].…”

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confidence: 99%

Pushing run-and-tumble particles through a rugged channel

Bijnens¹,

Maes

2021

J. Stat. Mech.

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We analyze the case of run-and-tumble particles pushed through a rugged channel both in the continuum and on the lattice. The current characteristic is non-monotone in the external field with the appearance of a current and nontrivial density profile even at zero field for asymmetric obstacles. If an external field is exerted against the direction of that zero-field current, then the resulting current decreases with persistence at small field and increases with persistence at large field. Activity in terms of self-propulsion increases the maximal current and postpones dying. We give an effective theoretical description with wider validity. I. INTRODUCTIONA nonequilibrium system, be it transient or stationary driven, is very sensitive to time-symmetric constraints and obstacles. Kinetic constraints or disorder indeed influence relaxation, diffusion and transport even for independent particles. For transport in out-ofequilibrium systems, even at small (and even zero) external driving, the frenetic contribution complements entropic considerations (as in the fluctuation-dissipation relation) to enter crucially in the current characteristic [1,2]. Examples where the response to external fields, temperature or chemical affinities show negative differential susceptibility include [3][4][5][6][7][8][9]. In the present paper we revisit the set up of [3,4] but for active particles as studied before e.g. also in [10][11][12][13][14][15]: how does the current characteristic change as a function of the persistence?Active matter consists of self-propelled particles, characterized by a coupling between motion and an internal degree of freedom, quantified by persistence [16][17][18][19][20]. Their dynamics model bacteria-motion and nanomotors or active colloids for their locomotion, possibly showing collective effects such as flocking or phase separation [21][22][23][24][25][26]. Also individually they

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“…The enhancement or reduction of activity included clustering by random disorder depends on the density and strength of the disorder. In addition to random disorder, there have been a variety of studies examining active matter coupled to periodic substrates which reveal directional locking effects [44][45][46], nonlinear transport [47][48][49][50], and commensuration effects [51,52].…”

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confidence: 99%

Active Matter Shepherding and Clustering in Inhomogeneous Environments

Forgacs,

Libal,

Reichhardt

et al. 2021

Preprint

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Trapping and sorting of active matter in a periodic background potential

Cited by 21 publications

References 29 publications

Directional Locking Effects for Active Matter Particles Coupled to a Periodic Substrate

Directional Locking Effects for Active Matter Particles Coupled to a Periodic Substrate

Pushing run-and-tumble particles through a rugged channel

Active Matter Shepherding and Clustering in Inhomogeneous Environments

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