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arXiv 1607.00993cond-mat.softcond-mat.stat-mech
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无热自推进粒子的局域有序控制

Controlling local order of athermal self-propelled particles

Niamh Dougan, Peter Crowther, Francesco Turci, C. Patrick Royall

摘要:

我们考虑一个模型的自推进动力学的非热活性粒子,其中的非平衡主动力建模的Ornstein-Uhlenbeck过程。在无驱动力的限制下,模型简化为原子玻璃形成流体Wahnström二元混合物的被动布朗动力学。众所周知,Wahnström混合物显示出缓慢动力学的出现与基于二十面体的局部有利结构的形成之间的强烈相关性。在这里,我们研究了非平衡力如何影响系统的局部结构,并发现这些强烈促进二十面体秩序。富含局部二十面体序的相对应于非常低势能的配置,这表明自推进模型中的非平衡动力学可以有效地用于探索二元混合物的势能面,并且可以获得使用被动动力学难以达到的状态。

英文摘要:

We consider a model of self-propelled dynamics for athermal active particles, where the non-equilibrium active forces are modelled by a Ornstein-Uhlenbeck process. In the limit of no-driving force, the model reduces to the passive, Brownian dynamics of an atomistic glass forming fluid, the Wahnström binary mixture. The Wahnström mixture is known to show strong correlations between the emergence of slow dynamics and the formation of locally favoured structures based on icosahedra. Here, we study how the non-equilibrium forces affect the local structure of the system, and find that these strongly promote icosahedral order. The phases rich in local icosahedral order correspond to configurations of very low potential energy, suggesting that the non-equilibrium dynamics in the self propelled model can be effectively exploited to explore the potential energy surface of the binary mixture and have access to states that are difficult to attain using passive dynamics.

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