Brownian motion exhibiting absolute negative mobility

TL;DR

This paper demonstrates that a Brownian particle in a symmetric, periodic system can exhibit absolute negative mobility, moving opposite to an applied static force, under non-equilibrium conditions.

Contribution

It introduces a model showing absolute negative mobility in a symmetric, periodic system far from thermal equilibrium, which can be realized experimentally.

Findings

Particle velocity is negative when force is positive.

Particle velocity is positive when force is negative.

Absolute negative mobility occurs under non-equilibrium conditions.

Abstract

We consider a single Brownian particle in a spatially symmetric, periodic system far from thermal equilibrium. This setup can be readily realized experimentally. Upon application of an external static force F, the average particle velocity is negative for F>0 and positive for F<0 (absolute negative mobility).