Brownian dynamics of self-regulated particles with additional degrees of freedom: Symmetry breaking and homochirality

Bhattacharyya, Debankur; Paul, Shibashis; Ghosh, Sucharita; Ray, Deb Shankar

doi:10.1103/physreve.97.042125

Cited by 4 publications

(1 citation statement)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Active particles exhibit fascinating non-equilibrium phenomena, like autonomous directed motion in the spacial periodic structures with broken inversion centre [13,[22][23][24], giant drift velocity opposite to the applied force [25,26], transient drifts toward fuel concentration gradients reminiscent of chemotactic motions [27][28][29] etc. Further, active particles display an interesting collective phenomenon: motility-induced phase separation (MIPS) [30][31][32][33][34][35][36][37][38]. Through this mechanism, active particles coexist between two phases of different densities.…”

Section: Introductionmentioning

confidence: 99%

Driven transport of active particles through arrays of symmetric obstacles

Nayak,

Das,

Bag

et al. 2023

The Journal of Chemical Physics

View full text Add to dashboard Cite

We numerically examine the driven transport of an overdamped self-propelled particle through a two-dimensional array of circular obstacles. A detailed analysis of transport quantifiers (mobility and diffusivity) has been performed for two types of channels, channel I and channel II, that respectively correspond to the parallel and diagonal drives with respect to the array axis. Our simulation results show that the signatures of pinning actions and depinning processes in the array of obstacles are manifested through excess diffusion peaks or sudden drops in diffusivity, and abrupt jumps in mobility with varying amplitude of the drive. The underlying depinning mechanisms and the associated threshold driving strength largely depend on the persistent length of self-propulsion. For low driving strength, both diffusivity and mobility are noticeably suppressed by the array of obstacles, irrespective of the self-propulsion parameters and direction of the drive. When self-propulsion length is larger than a channel compartment size, transport quantifiers are insensitive to the rotational relaxation time. Transport with diagonal drives features self-propulsion-dependent negative differential mobility. The amplitude of the negative differential mobility of an active particle is much larger than that of a passive one. The present analysis aims at understanding the driven transport of active species like, bacteria, virus, Janus particle etc. in porous medium.

show abstract

Section: Introductionmentioning

confidence: 99%

Driven transport of active particles through arrays of symmetric obstacles

Nayak,

Das,

Bag

et al. 2023

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

Activated barrier crossing dynamics of a Janus particle carrying cargo

Debnath

Ghosh

2018

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

We numerically study the escape kinetics of a self-propelled Janus particle, carrying a cargo, from a meta-stable state. We assume that the cargo is attached to the Janus particle by a flexible harmonic spring. We take into account the effect of the velocity field created in the fluid due to movements of the dimer's components, by considering a space-dependent diffusion tensor (Oseen tensor). Our simulation results show that the synchronization between barrier crossing events and the rotational relaxation process can enhance the escape rate to a large extent. Also, the load carrying capability of a Janus particle is largely controlled by its rotational dynamics and self-propulsion velocity. Moreover, the hydrodynamic interaction, conspicuously, enhances the escape rate of the Janus-cargo dimer. The most important features in escape kinetics have been justified based on analytic arguments.

show abstract

Noise-induced symmetry breaking of self-regulators: Nonequilibrium transition toward homochirality

Rafeek

Mondal

2021

The Journal of Chemical Physics

View full text Add to dashboard Cite

We present a theoretical model to study the origin of chiral symmetry breaking of a racemic mixture of optically active biomolecules. We consider a collection of Brownian particles, which can stay in any of the three possible isomeric states: one achiral and two enantiomers. Isomers are undergoing self-regulatory reaction along with chiral inhibition and achiral decay processes. The reaction rates of the isomeric states are guided by their neighbors as well as the thermal fluctuations of the system. We find that an alteration in the relative dominance of self-regulation, chiral inhibition, and achiral decay processes breaks the chiral symmetry of the system, which is either partial or complete. This results in four different asymmetric population states, viz., three-isomer coexistence, enantiomeric coexistence, chiral–achiral coexistence, and homochiral state. A change in the reaction condition induces nonequilibrium transition among these states. We also report that a fast stochastic self-regulation and a slow chiral inhibition and achiral decay process along with a threshold population of interacting neighbors suffice for the requisite for transition toward a completely symmetry broken state, i.e., homochirality.

show abstract

Brownian dynamics of self-regulated particles with additional degrees of freedom: Symmetry breaking and homochirality

Cited by 4 publications

References 49 publications

Driven transport of active particles through arrays of symmetric obstacles

Driven transport of active particles through arrays of symmetric obstacles

Activated barrier crossing dynamics of a Janus particle carrying cargo

Noise-induced symmetry breaking of self-regulators: Nonequilibrium transition toward homochirality

Contact Info

Product

Resources

About