Nonequilibrium Fluctuations and Enhanced Diffusion of a Driven Particle in a Dense Environment - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2018

Nonequilibrium Fluctuations and Enhanced Diffusion of a Driven Particle in a Dense Environment

Abstract

We study the diffusion of a tracer particle driven out of equilibrium by an external force and traveling in a dense environment of arbitrary density. The system evolves on a discrete lattice and its stochastic dynamics is described by a master equation. Relying on a decoupling approximation that goes beyond the naive mean-field treatment of the problem, we calculate the fluctuations of the position of the tracer around its mean value on a lattice of arbitrary dimension, and with different boundary conditions. We reveal intrinsically nonequilibrium effects, such as enhanced diffusivity of the tracer induced by both the crowding interactions and the external driving. We finally consider the high-density and low-density limits of the model and show that our approximation scheme becomes exact in these limits.
Fichier principal
Vignette du fichier
Phys_Rev_Lett_Enhanced_Diffusion.pdf (239.96 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

hal-02323315 , version 1 (21-10-2019)

Identifiers

Cite

Pierre Illien, Olivier Bénichou, Gleb Oshanin, Alessandro Sarracino, Raphael Voituriez. Nonequilibrium Fluctuations and Enhanced Diffusion of a Driven Particle in a Dense Environment. Physical Review Letters, 2018, 120 (20), ⟨10.1103/PhysRevLett.120.200606⟩. ⟨hal-02323315⟩
14 View
57 Download

Altmetric

Share

Gmail Facebook X LinkedIn More