article · 16/05/2018
Nonequilibrium Fluctuations and Enhanced Diffusion of a Driven Particle in a Dense Environment
Résumé
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.
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Illien, P., Benichou, O., Oshanin, G., Sarracino, A., & Voituriez, R. (2018). Nonequilibrium Fluctuations and Enhanced Diffusion of a Driven Particle in a Dense Environment. Phys. Rev. Lett., 120(20). https://doi.org/10.1103/PhysRevLett.120.200606@article{Illien2018_280,
author = {Illien, Pierre and Benichou, Olivier and Oshanin, Gleb and Sarracino, Alessandro and Voituriez, Raphael},
year = {2018},
month = {5},
title = {Nonequilibrium Fluctuations and Enhanced Diffusion of a Driven Particle in a Dense Environment},
journal = {Phys. Rev. Lett.},
publisher = {AMER PHYSICAL SOC},
volume = {120},
number = {20},
address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
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.},
url = {http://www.dx.doi.org/10.1103/PhysRevLett.120.200606},
doi = {10.1103/PhysRevLett.120.200606},
issn = {0031-9007},
}TY - JOUR
AU - Illien, Pierre
AU - Benichou, Olivier
AU - Oshanin, Gleb
AU - Sarracino, Alessandro
AU - Voituriez, Raphael
PY - 2018
DA - 2018/05/16
TI - Nonequilibrium Fluctuations and Enhanced Diffusion of a Driven Particle in a Dense Environment
JO - Phys. Rev. Lett.
VL - 120
IS - 20
PB - AMER PHYSICAL SOC
SN - 0031-9007
AB - 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.
DO - 10.1103/PhysRevLett.120.200606
UR - http://www.dx.doi.org/10.1103/PhysRevLett.120.200606
ER -