Algebraic correlations and anomalous fluctuations in ordered flocks of Janus particles fueled by an AC electric field
Algebraic correlations and anomalous fluctuations in ordered flocks of Janus particles fueled by an AC electric field
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DOI：
10.1103/physrevresearch.3.043104
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发表时间：
2020-11
影响因子：
4.2
通讯作者：
J. Iwasawa;Daiki Nishiguchi;M. Sano
中科院分区：
文献类型：
--
作者：
J. Iwasawa;Daiki Nishiguchi;M. Sano
研究了在交流电场作用下Janus胶体粒子的极性集体动力学。当密度足够高时，粒子之间的极性相互作用诱导出极性取向有序态，其表现出令人想起Vicsek模型的特征，如真正的长程有序和巨数涨落。在单粒子水平上对极性和速度的独立测量使我们能够研究有序状态下的单粒子动力学。我们发现了理论上未解决的统计性质的有序状态，如极性和速度的非对称关系，增强旋转扩散强于无序状态，和代数自相关的极性。我们的实验结果，在Vicsek物理和主动布朗粒子物理的交叉点，揭示了迄今为止未探索的物理所产生的极性和速度之间的相互作用。
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, sheds light on the so-far-unexplored physics arising from the interplay between the polarity and the velocity.