实验实现的非高斯相关棘轮中的输运和扩散增强
Transport and Diffusion Enhancement in Experimentally Realized Non-Gaussian Correlated Ratchets
摘要：
已知活细胞由于各种活性过程而产生显著大于热波动的非高斯活性波动。了解这些活跃的涨落对各种物理化学过程的影响，例如分子马达的输运，是非平衡物理学中的一个基本问题。因此，我们的实验和数值研究的主动布朗棘轮包括一个胶体粒子在光学产生的非对称周期性的潜在驱动的非高斯噪声具有有限振幅的主动爆发，每个到达随机和指数衰减。我们发现，粒子速度是最大的相对稀疏的爆发有限的相关时间和非高斯分布。这些偶尔的踢，产生布朗但非高斯扩散，是更有效的传输和粒子的扩散增强比主动奥恩斯坦-乌伦贝克噪声的不断踢。
英文摘要：
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 study 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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