Fick-Jacobs description and first passage dynamics for diffusion in a channel under stochastic resetting

TL;DR

This paper extends the Fick-Jacobs theory to include stochastic resetting, providing exact analytical expressions for first passage times and escape probabilities, and demonstrating how resetting can optimize particle transport in channels.

Contribution

It introduces a novel theoretical framework combining resetting with channel diffusion, offering exact solutions and insights into optimizing transport efficiency.

Findings

Resetting can accelerate particle transport in channels.

Optimal resetting rates minimize the particle lifetime inside the channel.

Theoretical predictions are validated by three-dimensional Brownian dynamics simulations.

Abstract

Transport of particles through channels is of paramount importance in physics, chemistry and surface science due to its broad real world applications. Much insights can be gained by observing the transition paths of a particle through a channel and collecting statistics on the lifetimes in the channel or the escape probabilities from the channel. In this paper, we consider the diffusive transport through a narrow conical channel of a Brownian particle subject to intermittent dynamics, namely, stochastic resetting. As such, resetting brings the particle back to a desired location from where it resumes its diffusive phase. To this end, we extend the Fick-Jacobs theory of channel-facilitated diffusive transport to resetting-induced transport. Exact expressions for the conditional mean first passage times, escape probabilities and the total average lifetime in the channel are obtained, and their behaviour as a function of the resetting rate are highlighted. It is shown that resetting can expedite the transport through the channel -- rigorous constraints for such conditions are then illustrated. Furthermore, we observe that a carefully chosen resetting rate can render the average lifetime of the particle inside the channel minimal. Interestingly, the optimal rate undergoes continuous and discontinuous transitions as some relevant system parameters are varied. The validity of our one-dimensional analysis and the corresponding theoretical predictions are supported by three-dimensional Brownian dynamics simulations. We thus believe that resetting can be useful to facilitate particle transport across biological membranes -- a phenomena that can spearhead further theoretical and experimental studies.