Spontaneous Velocity Alignment in Motility-Induced Phase Separation
Spontaneous Velocity Alignment in Motility-Induced Phase Separation
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DOI：
10.1103/physrevlett.124.078001
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发表时间：
2020-02-19
影响因子：
8.6
通讯作者：
Puglisi, A.
中科院分区：
文献类型：
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作者：
Caprini, L.;Marconi, U. Marini Bettolo;Puglisi, A.
我们研究了一个系统的纯排斥球形自推进粒子在最小设置诱导运动诱导相分离（MIPS）。我们发现，即使没有明确的对齐相互作用，在群集粒子的速度伴随MIPS的增长顺序。颗粒排列成对齐或漩涡状域的大小增加的持久性的自我推进的增长，量化研究的速度的空间相关函数的效果。我们解释的速度对齐揭示了一个隐藏的对齐相互作用的Vicsek样的形式，诱导的空间相互作用和自推进之间的相互作用。
We study a system of purely repulsive spherical self-propelled particles in the minimal setup inducing motility-induced phase separation (MIPS). We show that, even if explicit alignment interactions are absent, a growing order in the velocities of the clustered particles accompanies MIPS. Particles arrange into aligned or vortexlike domains whose size increases as the persistence of the self-propulsion grows, an effect that is quantified studying the spatial correlation function of the velocities. We explain the velocity alignment by unveiling a hidden alignment interaction of the Vicsek-like form, induced by the interplay between steric interactions and self-propulsion.