非均匀环境中的活性物质牧集与聚集
Active Matter Shepherding and Clustering in Inhomogeneous Environments
AI总结：
研究非均匀环境中活性与被动盘混合物的动力学，发现马达力和钉扎密度决定多种相，包括两步牧集相分离、缓慢强梯度态及均匀浮动聚集态。
摘要：
我们考虑一个由活性和被动run-and-tumble盘组成的混合物，处于非均匀环境中，其中仅一半样本包含淬火无序或钉扎。这些盘以均匀密度的完全混合状态初始化。我们根据马达力和钉扎密度识别出几个不同的动力学相。在高钉扎密度和高马达力下，存在一个两步过程，首先由活性和被动盘在钉扎区域快速积累引发，这会在系统中产生大的密度梯度。随后是一个较慢的物种相分离过程，其中被动盘被活性盘牧集到无钉扎区域，形成非聚集流体，并产生更均匀的密度和物种相分离。对于更高的钉扎密度和低马达力，动力学变得非常缓慢，系统保持强密度梯度。对于较弱的钉扎和大的马达力，出现一个浮动聚集态，系统的时间平均密度是均匀的。我们在动态相图中说明了这些相的出现。
英文摘要：
We consider a mixture of active and passive run-and-tumble disks in an inhomogeneous environment where only half of the sample contains quenched disorder or pinning. The disks are initialized in a fully mixed state of uniform density. We identify several distinct dynamical phases as a function of motor force and pinning density. At high pinning densities and high motor forces, there is a two step process initiated by a rapid accumulation of both active and passive disks in the pinned region, which produces a large density gradient in the system. This is followed by a slower species phase separation process where the inactive disks are shepherded by the active disks into the pin-free region, forming a non-clustered fluid and producing a more uniform density with species phase separation. For higher pinning densities and low motor forces, the dynamics becomes very slow and the system maintains a strong density gradient. For weaker pinning and large motor forces, a floating clustered state appears and the time averaged density of the system is uniform. We illustrate the appearance of these phases in a dynamic phase diagram.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
