论文标题
干燥活性物质表现出自组织的“跨海”阶段
Dry Active Matter exhibits a self-organized 'Cross Sea' Phase
论文作者
论文摘要
在三个不同的阶段中，已知的自旋细颗粒的Vicsek模型是：（i）一个极有序的同质相，也称为碳纤维-TU相，（iii）一个极有序定期布置的高密度带（波）的相位，其周围的低密度区域无层和（iv）均无层面的低密度区域。有人质疑频段（iii）是否应分为两个部分[Chaté2020]：一个定期布置，一个具有强烈的相互作用但没有有序的频段。我们通过表明标准Vicsek模型具有大型系统大小的第四阶段来回答这个问题：（ii）极有序的跨海相。接近向（i）的过渡，此阶段变得不稳定，看起来像是强烈的相互作用的频段。我们证明，跨海不仅是两个波的叠加，而且是一种独立的复杂模式。此外，我们表明，通过其共同移动框架内的横海模式结构存在非零的质量流。
The Vicsek model of self-propelled particles is known in three different phases: (i) a polar ordered homogeneous phase also called Toner-Tu phase, (iii) a phase of polar ordered regularly arranged high density bands (waves) with surrounding low density regions without polar order and (iv) a homogeneous phase without polar order. It has been questioned whether the band phase (iii) should be divided into two parts [Chaté2020]: one with periodically arranged and one with strongly interacting but not ordered bands. We answer this question by showing that the standard Vicsek model has a fourth phase for large system sizes: (ii) a polar ordered cross sea phase. Close to the transition towards (i) this phase becomes unstable and looks like strongly interacting bands. We demonstrate that the cross sea phase is not just a superposition of two waves, but it is an independent complex pattern. Furthermore we show that there is a non-zero mass flow through the structure of the cross sea pattern within its co-moving frame.
