论文标题

衰老或死亡:非单调反应对活动眼镜中弱自我的反应的起源

Aging or DEAD: origin of the non-monotonic response to weak self-propulsion in active glasses

论文作者

Klongvessa, Natsuda, Ybert, Christophe, Cottin-Bizonne, Cécile, Kawasaki, Takeshi, Leocmach, Mathieu

论文摘要

在无定形状态下,玻璃的定义是放松时间比观察时间更长。这种非迫切性质使对玻璃系统的理解成为涉及的主题,对进一步平衡的外部驱动器产生了复杂的衰老效果或反应。在这方面,由自螺旋体颗粒制成的活跃眼镜最近成为刺激系统,通过考虑新颖的内部内部平衡程度,可以扩大和挑战我们当前对眼镜的理解。在先前的实验研究中,我们已经表明,在奇异性破裂相中,密集的被动颗粒的动力学首先会减慢颗粒,然后在更大的活性下加快颗粒的速度。在这里,我们表明这种非单调行为也出现在软活跃的布朗颗粒的模拟中并探索其原因。我们驳斥了我们先前提出的主动方向(死)模型的出现僵局,描述了我们的数据。但是,我们证明了非单调响应是由于活性增强了衰老,因此证实了与牙术断裂的联系。除了自构的系统之外,我们的结果表明,活跃眼镜中的老化尚未完全了解。

Among amorphous states, glass is defined by relaxation times longer than the observation time. This nonergodic nature makes the understanding of glassy systems an involved topic, with complex aging effects or responses to further out-of-equilibrium external drivings. In this respect active glasses made of self-propelled particles have recently emerged as stimulating systems which broadens and challenges our current understanding of glasses by considering novel internal out-of-equilibrium degrees of freedom. In previous experimental studies we have shown that in the ergodicity broken phase, the dynamics of dense passive particles first slows down as particles are made slightly active, before speeding up at larger activity. Here, we show that this nonmonotonic behavior also emerges in simulations of soft active Brownian particles and explore its cause. We refute that the Deadlock by Emergence of Active Directionality (DEAD) model we proposed earlier describes our data. However, we demonstrate that the nonmonotonic response is due to activity enhanced aging, and thus confirm the link with ergodicity breaking. Beyond self-propelled systems, our results suggest that aging in active glasses is not fully understood.

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