论文标题
代数相关性和异常波动在由AC电场燃料的Janus颗粒群中
Algebraic correlations and anomalous fluctuations in ordered flocks of Janus particles fueled by an AC electric field
论文作者
论文摘要
我们研究了由交流电场推动的Janus胶体颗粒的极性集体动力学。当密度足够高时，颗粒之间的极性相互作用会引起极性定向有序状态，该状态具有让人联想到Vicsek模型的特征，例如真实的远距离顺序和巨大的数字波动。单个粒子水平的极性和速度的独立测量使我们能够研究有序状态内的单个粒子动力学。我们发现了有序状态的理论上未解决的统计特性，例如极性和速度的不对称关系，比无序状态更强的旋转扩散增强，以及对极性的代数自动相关。我们在Vicsek物理学和活跃的Brownian颗粒物理学的十字路口的实验发现，揭示了由极性和速度之间的相互作用引起的So far unexploplyplypleply。
We study the polar collective dynamics of Janus colloidal particles fueled by an AC electric field. When the density is high enough, the polar interactions between the particles induce a polar orientationally ordered state which exhibits features reminiscent of the Vicsek model such as true long-range order and giant number fluctuations. Independent measurements of the polarity and velocity at the single particle level allowed us to investigate the single particle dynamics within the ordered state. We discovered theoretically-unaddressed statistical properties of the ordered state such as the asymmetric relation of polarity and velocity, enhanced rotational diffusion stronger than in the disordered state, and an algebraic auto-correlation of the polarity. Our experimental findings, at the crossroad of the Vicsek physics and the Active Brownian Particles physics, shed light on the so-far-unexplored physics arising from the interplay between the polarity and the velocity.
