Active ratchets
Active ratchets
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DOI：
10.1209/0295-5075/96/68002
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发表时间：
2011-12-01
期刊：
影响因子：
1.8
通讯作者：
Di Leonardo, R.
中科院分区：
文献类型：
--
作者：
Angelani, L.;Costanzo, A.;Di Leonardo, R.
我们分析周期性非对称势中的自行式有机体或活性粒子。与需要外力的布朗粒子的标准棘轮效应不同，在活动粒子的情况下，仅非对称势就会产生净漂移速度(主动棘轮效应)。通过理论模型和数值模拟，我们证明了在非对称分段周期势存在的情况下，整流过程的出现。破坏的空间对称性(外势)和时间对称性(活性粒子)是维持单向运输的足够成分。我们的发现为利用外部周期静电场以定向方式运动生物体开辟了新的机制。版权所有(C)Epla，2011
We analyze self-propelling organisms, or active particles, in a periodic asymmetric potential. Unlike standard ratchet effect for Brownian particles requiring external forcing, in the case of active particles asymmetric potential alone produces a net drift speed (active ratchet effect). By using theoretical models and numerical simulations we demonstrate the emergence of the rectification process in the presence of an asymmetric piecewise periodic potential. The broken spatial symmetry (external potential) and time symmetry (active particles) are sufficient ingredients to sustain unidirectional transport. Our findings open the way to new mechanisms to move in directional manner motile organisms by using external periodic static fields. Copyright (C) EPLA, 2011