论文标题
Fick-Jacobs的描述和第一个通道动力学,用于在随机重置下在通道中扩散的动态
Fick-Jacobs description and first passage dynamics for diffusion in a channel under stochastic resetting
论文作者
论文摘要
由于其广泛的现实世界应用,颗粒通过通道的运输在物理,化学和表面科学中至关重要。通过观察粒子通过通道的过渡路径并收集有关通道中的寿命或逃生概率从通道中收集统计的统计数据,可以获得许多见解。在本文中,我们考虑了经过间歇性动力学的布朗粒子的狭窄锥形通道的扩散转运,即随机重置。因此,重置将粒子带回所需的位置,从那里恢复其扩散相。为此,我们扩展了通道相关扩散传输的虫雅各布理论,以重置引起的运输。有条件平均第一次通过时间,逃生概率和通道中的总平均寿命的精确表达式,并突出显示其行为作为重置率的函数。结果表明,重置可以加快通过通道的运输加快运输 - 然后说明了这种情况的严格约束。此外,我们观察到,精心选择的重置速率可以使通道内部粒子的平均寿命最小化。有趣的是,随着某些相关的系统参数的变化,最佳速率经历了连续和不连续的过渡。我们的一维分析和相应的理论预测的有效性由三维的布朗动力学模拟支持。因此,我们认为重置可用于促进跨生物膜的颗粒传输,这种现象可以率先进一步进行理论和实验研究。
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.