Self-Propelled Particles with Velocity Reversals and Ferromagnetic Alignment: Active Matter Class with Second-Order Transition to Quasi-Long-Range Polar Order
Self-Propelled Particles with Velocity Reversals and Ferromagnetic Alignment: Active Matter Class with Second-Order Transition to Quasi-Long-Range Polar Order
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具有速度反转和铁磁排列的自驱动粒子：具有二阶跃迁到准长程极序的活性物质类
DOI：
10.1103/physrevlett.120.258002
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发表时间：
2018
影响因子：
8.6
通讯作者：
Chate H.
中科院分区：
文献类型：
--
作者：
Mahault B.;Jiang X. -C.;Bertin E.;Ma Y. -Q.;Patelli A.;Shi X. -Q.;Chate H.
我们在两个维度上介绍和研究一类新的干的，对齐的活性物质，表现出直接过渡到取向顺序，没有通常在这种情况下观察到的相分离现象。这类系统的特征是具有速度反转和铁磁排列的自推进粒子，具有连续变化的标度指数，显示出准长程极序，但对这种转变的数值研究得出结论，它不属于Berezinskiiii-Kosterlitz-numerless普适类，但最好描述为具有代数相关性发散的标准临界点。我们合理化这些发现表明，秩序和密度之间的相互作用改变了缺陷的作用。
We introduce and study in two dimensions a new class of dry, aligning active matter that exhibits a direct transition to orientational order, without the phase-separation phenomenology usually observed in this context. Characterized by self-propelled particles with velocity reversals and a ferromagnetic alignment of polarities, systems in this class display quasi-long-range polar order with continuously varying scaling exponents, yet a numerical study of the transition leads to conclude that it doesnotbelong to the Berezinskii-Kosterlitz-Thouless universality class but is best described as a standard critical point with an algebraic divergence of correlations. We rationalize these findings by showing that the interplay between order and density changes the role of defects.