A particle-field approach bridges phase separation and collective motion in active matter.
A particle-field approach bridges phase separation and collective motion in active matter.
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DOI：
10.1038/s41467-020-18978-5
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发表时间：
2020-10-23
影响因子：
16.6
通讯作者：
Peruani F
中科院分区：
文献类型：
--
作者：
Großmann R;Aranson IS;Peruani F
自走式硬盘经历了运动诱导的相分离，而自走式杆则表现出各种非平衡现象，包括聚类、集体运动和时空混沌。在这项工作中，我们提出了一个用连续场表示活性粒子的理论框架。这一概念结合了基于对齐的模型的简单性，使分析研究成为可能，以及明确包含自推进物体形状的现实模型。通过改变颗粒形状从圆形到椭球形，我们展示了非平衡应力如何作用于自走杆之间破坏运动诱导的相分离和促进取向有序，从而连接标量和矢量活性物质的领域。虽然相互作用势是严格的极序，但极序和向列序都可能出现，甚至共存。因此，有序态的对称性是活性物质的一种动力学性质。所提出的框架可以代表各种系统，包括细菌菌落、细胞骨架提取物或摇匀颗粒介质。相互作用的自推进粒子根据粒子形状表现出相分离或集体运动。连接这些范式的统一理论代表了活性物质的主要挑战，作者在这里通过将活性粒子建模为连续场来解决这个问题。
Whereas self-propelled hard discs undergo motility-induced phase separation, self-propelled rods exhibit a variety of nonequilibrium phenomena, including clustering, collective motion, and spatio-temporal chaos. In this work, we present a theoretical framework representing active particles by continuum fields. This concept combines the simplicity of alignment-based models, enabling analytical studies, and realistic models that incorporate the shape of self-propelled objects explicitly. By varying particle shape from circular to ellipsoidal, we show how nonequilibrium stresses acting among self-propelled rods destabilize motility-induced phase separation and facilitate orientational ordering, thereby connecting the realms of scalar and vectorial active matter. Though the interaction potential is strictly apolar, both, polar and nematic order may emerge and even coexist. Accordingly, the symmetry of ordered states is a dynamical property in active matter. The presented framework may represent various systems including bacterial colonies, cytoskeletal extracts, or shaken granular media. Interacting self-propelled particles exhibit phase separation or collective motion depending on particle shape. A unified theory connecting these paradigms represents a major challenge in active matter, which the authors address here by modeling active particles as continuum fields.
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影响因子：
2.4
作者：
Abkenar, Masoud;Marx, Kristian;Gompper, Gerhard
通讯作者：
Gompper, Gerhard
影响因子：
8.6
作者：
Caprini, L.;Marconi, U. Marini Bettolo;Puglisi, A.
通讯作者：
Puglisi, A.
影响因子：
2.4
作者：
Grossmann, Robert;Peruani, Fernando;Baer, Markus
通讯作者：
Baer, Markus
DOI：
10.1073/pnas.2000061117
发表时间：
2020-05-05
影响因子：
11.1
作者：
Han, Koohee;Kokot, Gasper;Snezhko, Alexey
通讯作者：
Snezhko, Alexey
影响因子：
4.4
作者：
BERNE, BJ;PECHUKAS, P
通讯作者：
PECHUKAS, P