布朗运动
高斯分布
棘轮
物理
非平衡态热力学
统计物理学
噪音(视频)
扩散
振幅
粒子(生态学)
高斯噪声
热涨落
分子马达
反常扩散
经典力学
作者
Govind Paneru,Jin Tae Park,Hyuk Kyu Pak
标识
DOI:10.1021/acs.jpclett.1c03037
摘要
Living cells are known to generate non-Gaussian active fluctuations significantly larger than thermal fluctuations owing to various active processes. Understanding the effect of these active fluctuations on various physicochemical processes, such as the transport of molecular motors, is a fundamental problem in nonequilibrium physics. Therefore, we experimentally and numerically studied an active Brownian ratchet comprising a colloidal particle in an optically generated asymmetric periodic potential driven by non-Gaussian noise having finite-amplitude active bursts, each arriving at random and decaying exponentially. We find that the particle velocity is maximum for relatively sparse bursts with finite correlation time and non-Gaussian distribution. These occasional kicks, which produce Brownian yet non-Gaussian diffusion, are more efficient for transport and diffusion enhancement of the particle than the incessant kicks of active Ornstein-Uhlenbeck noise.
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