Transport of overdamped Brownian particles in a two-dimensional tube: Nonadiabatic regime

TL;DR

This study investigates how nonadiabatic periodic forces influence the transport of overdamped Brownian particles in a 2D asymmetric tube, revealing current reversals and multiple maxima in response to driving parameters.

Contribution

It demonstrates the distinct behaviors in nonadiabatic regimes compared to adiabatic ones, highlighting frequency-dependent current reversals and resonance-like maxima.

Findings

Current direction can be reversed by tuning driving frequency.

Multiple local maxima in current as a function of driving amplitude.

Transport behaviors differ significantly from adiabatic cases.

Abstract

Transport of overdamped Brownian particles in a two-dimensional asymmetric tube is investigated in the presence of nonadiabatic periodic driving forces. By using Brownian dynamics simulations we can find that the phenomena in nonadiabatic regime differ from that in adiabatic case. The direction of the current can be reversed by tuning the driving frequency. Remarkably, the current as a function of the driving amplitude exhibits several local maxima at finite driving frequency.