Transport Coherence in Frictional Ratchets

TL;DR

This paper investigates noise-induced directed transport in frictional ratchets, revealing that such systems do not exhibit strong coherence in transport due to dominant diffusion effects, unlike other ratchet models.

Contribution

It provides analytical expressions for current and diffusion in frictional ratchets and highlights the lack of pronounced transport coherence in these systems.

Findings

Analytical expressions for current and diffusion coefficient derived.

Frictional ratchets do not show strong transport coherence.

Diffusion overshadowing directed transport in finite systems.

Abstract

We study the phenomena of noise induced transport in frictional ratchet systems. For this we consider a Brownian particle moving in a space dependent frictional medium in the presence of external white noise fluctuations. To get the directed transport, unlike in other ratchet models like flashing or rocking ratchets etc., we do not require the potential experienced by the particle to be asymmetric nor do we require the external fluctuations to be correlated. We have obtained analytical expressions for current and the diffusion coefficient. We show that the frictional ratchet do not exhibit a pronounced coherence in the transport in that the diffusion spread overshadows the accompanying directed transport in system with finite spatial extensions.