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arXiv 2203.05433cond-mat.soft
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相分离活性流体中的逾渗转变

Percolation transition in phase separating active fluid

Monika Sanoria, Raghunath Chelakkot, Amitabha Nandi

摘要:

具有排斥相互作用的活性颗粒所表现出的运动诱导的相分离是众所周知的。我们发现,活性粒子的相互作用的柔软性不稳定的高度有序的致密相,导致形成一个多孔的集群跨越系统。如果颗粒运动性增加超过临界值,也可以实现这种\emph{soft limit},在该临界值处,系统清楚地表现出标准渗滤转变的所有特征。我们还表明,在无热极限,活性粒子表现出类似的过渡,即使在低运动。有了这些新的相,排斥性活性粒子的相图显示出比以前设想的更丰富。

英文摘要:

The motility-induced phase separation exhibited by active particles with repulsive interactions is well known. We show that the interaction softness of active particles destabilizes the highly ordered dense phase, leading to the formation of a porous cluster which spans the system. This \emph{soft limit} can also be achieved if the particle motility is increased beyond a critical value, at which the system clearly exhibits all the characteristics of a standard percolation transition. We also show that in the athermal limit, active particles exhibit similar transitions even at low motility. With these additional new phases, the phase diagram of repulsive active particles is revealed to be richer than what was previously conceived.

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