Driven tracer with absolute negative mobility
Abstract
Instances of negative mobility, where a system responds to a perturbation in a way opposite to naive expectation, have been studied theoretically and experimentally in numerous nonequilibrium systems. In this work we show that Absolute Negative Mobility (ANM), whereby current is produced in a direction opposite to the drive, can occur around equilibrium states. This is demonstrated with a simple one-dimensional lattice model with a driven tracer. We derive analytical predictions in the linear response regime and elucidate the mechanism leading to ANM by studying the high-density limit. We also study numerically a model of hard Brownian disks in a narrow planar channel, for which the lattice model can be viewed as a toy model. We find that the model exhibits Negative Differential Mobility (NDM), but no ANM.
Cite
@article{arxiv.1710.03997,
title = {Driven tracer with absolute negative mobility},
author = {J. Cividini and D. Mukamel and H. A. Posch},
journal= {arXiv preprint arXiv:1710.03997},
year = {2018}
}