Barrier Crossing in a Viscoelastic Bath

Ginot, Félix; Caspers, Juliana; Krüger, Matthias; Bechinger, Clemens

doi:10.1103/physrevlett.128.028001

Cited by 30 publications

(17 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Resultsmentioning

confidence: 99%

“…Also, a recent study on the particle motion in the double-well potential in the presence of viscoelastic bath demonstrated the barrier-crossing enhancement is controlled by the time scales associated with the viscoelastic bath. 50 The observed barrier crossing enhancement and particle synchronization in the presence of nonGaussian active noise can be intuitively explained: the active noise randomly injects energy into the system, with a mean interval t P , and each pulse decays with a correlation time t c . For t c and t P o t r , several bursts kick the particle during its thermal relaxation time, thus increasing its effective temperature and enhancing the barrier crossing rate.…”

Section: Sr Without Periodic Modulationmentioning

confidence: 99%

See 1 more Smart Citation

Bona fide stochastic resonance under nonGaussian active fluctuations

2023

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Sr Without Periodic Modulationmentioning

confidence: 99%

Bona fide stochastic resonance under nonGaussian active fluctuations

2023

View full text Add to dashboard Cite

show abstract

“…As a first step towards modelling colloidal particles in actual correlated fluids, instead, it would be important to consider more realistic models of dynamics, possibly including the case of non-Gaussian fields, as well as of the interactions between the particle and the field, which usually take the form of boundary conditions for the latter. This would allow, inter alia, the investigation of the role of fluctuations in the dynamics of effective interactions among the particles immersed in the fluctuating medium [16,[32][33][34][35], or a finer account of the effect of viscoelasticity on the transition between two wells [36,37].…”

Section: Discussionmentioning

confidence: 99%

Dynamics of a colloidal particle coupled to a Gaussian field: from a confinement-dependent to a non-linear memory

Basu¹,

Démery²,

Gambassi³

2022

Preprint

View full text Add to dashboard Cite

The effective dynamics of a colloidal particle immersed in a complex medium is often described in terms of an overdamped linear Langevin equation for its velocity with a memory kernel which determines the effective (time-dependent) friction and the correlations of fluctuations. Recently, it has been shown in experiments and numerical simulations that this memory may depend on the possible optical confinement the particle is subject to, suggesting that this description does not capture faithfully the actual dynamics of the colloid, even at equilibrium. Here, we propose a different approach in which we model the medium as a Gaussian field linearly coupled to the colloid. The resulting effective evolution equation of the colloidal particle features a non-linear memory term which extends previous models and which explains qualitatively the experimental and numerical evidence in the presence of confinement. This non-linear term is related to the correlations of the effective noise via a novel fluctuation-dissipation relation which we derive.

show abstract

“…8 More recently, active colloids have been placed in increasingly complex environments, often with the intention of creating smart material structures that can be controlled via the active components. The complexity is increased using either passive particles, 9,10 introducing environments that are characterized by viscosity, 11 or chemical equlibiria, 12 and by introducing new capabilities like information processing. 13,14 A plethora of different types of collective dynamics in such phoretic active colloids has been theoretically predicted [15][16][17][18][19][20] and experimentally observed.…”

Section: Introductionmentioning

confidence: 99%

Pair interaction between catalytically active colloids

Sharan

Daddi-Moussa-Ider

Agudo-Canalejo

et al. 2022

Preprint

View full text Add to dashboard Cite

Due to the intrinsically complex non-equilbrium behavior of the constituents of active matter systems, a comprehensive understanding of their collective properties is a challenge that requires systematic bottom-up characterization of the individual components and their interactions. For self-propelled particles, an intrinsic complexity stems from the fact that the polar nature of the colloids necessitates that the interactions depend on positions and orientations of the particles, leading to a $2 d-1$ dimensional configuration space for each particle, in $d$ dimensions. Moverover, the interactions between such non-equilibrium colloids are generically non-reciprocal, which makes the characterization even more complex. Therefore, derivation of generic rules that enable us to predict the outcomes of individual encounters as well as the ensuing collective behavior will provide an important progress. While significant advances have been made on the theorical front, such systematic experimental characterizations using simple artificial systems with measurable parameters are scarce. Here, we study two different, contrasting types of colloidal microswimmers, which move in opposite directions and show distinctly different interactions. To facilitate the extraction of parameters, we introduce an experimental platform in which we confine them on a 1D track. Furthermore, we develop a theoretical model for interparticle interactions near a substrate, including both phoretic and hydrodynamic effects, which reproduces their behavior. For subsequent validation, we increase the degrees of freedom to two-dimensional motion and predict the resulting trajectories, finding remarkable agreement. Our results may prove useful in characterizing the overall alignment behavior of interacting self-propelling active swimmer and may find application in guiding the design of active-matter systems involving phoretic and hydrodynamic interactions.

show abstract

Barrier Crossing in a Viscoelastic Bath

Cited by 30 publications

References 29 publications

Bona fide stochastic resonance under nonGaussian active fluctuations

Bona fide stochastic resonance under nonGaussian active fluctuations

Dynamics of a colloidal particle coupled to a Gaussian field: from a confinement-dependent to a non-linear memory

Pair interaction between catalytically active colloids

Contact Info

Product

Resources

About