Velocity anomaly of a driven tracer in a confined crowded environment.
Velocity anomaly of a driven tracer in a confined crowded environment.
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受限拥挤环境中驱动示踪剂的速度异常。
DOI：
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发表时间：
2014
影响因子：
8.6
通讯作者：
R. Voituriez
中科院分区：
文献类型：
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作者：
P. Illien;O. Bénichou;G. Oshanin;R. Voituriez
我们考虑一个离散模型，在该模型中，示踪剂在受核心相互作用约束的粒子密集浴中进行对称随机行走，在外力的偏置下进行随机行走。我们揭示了在受限几何结构中出现的惊人速度异常：在条纹或毛细血管等准一维系统中，示踪剂的速度在最终下降到较低的值之前显示出一个长寿命的平台。我们开发了一种分析解决方案，定量地解释了这种有趣的行为。我们的分析表明，这种速度异常可能是准一维拥挤系统中驱动动力学的一般特征。
We consider a discrete model in which a tracer performs a random walk biased by an external force, in a dense bath of particles performing symmetric random walks constrained by hard-core interactions. We reveal the emergence of a striking velocity anomaly in confined geometries: in quasi-1D systems such as stripes or capillaries, the velocity of the tracer displays a long-lived plateau before ultimately dropping to a lower value. We develop an analytical solution that quantitatively accounts for this intriguing behavior. Our analysis suggests that such a velocity anomaly could be a generic feature of driven dynamics in quasi-1D crowded systems.