Dissipation controls transport and phase transitions in active fluids: mobility, diffusion and biased ensembles
Dissipation controls transport and phase transitions in active fluids: mobility, diffusion and biased ensembles
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DOI：
10.1088/1367-2630/ab6353
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发表时间：
2020-01-01
影响因子：
3.3
通讯作者：
Vaikuntanathan, Suriyanarayanan
中科院分区：
文献类型：
--
作者：
Fodor, Etienne;Nemoto, Takahiro;Vaikuntanathan, Suriyanarayanan
活性流体通过在颗粒水平上不断耗散能量来进行定向运动，产生动力学和相位，而没有任何平衡等效物。新兴的行为已经被广泛研究，但破译如何本地能量通量控制集体现象仍然是一个很大的挑战。我们提供了通用的活动引起的耗散和内部示踪剂的传输特性之间的关系。通过利用积极的波动和无序驱动之间的映射，我们的研究结果揭示了如何本地耗散，在自推进的基础上，通过减少流动性和扩散的粒子约束内部运输。然后，我们采用大偏差的技术来研究当耗散变化时相互作用是如何受到影响的。这使我们揭示了一个微观机制，以促进集群在低耗散，我们也表明集体运动在高耗散的存在。总的来说，这些结果说明了调谐耗散如何提供一种替代途径，在活性流体中的相变。
Active fluids operate by constantly dissipating energy at the particle level to perform a directed motion, yielding dynamics and phases without any equilibrium equivalent. The emerging behaviors have been studied extensively, yet deciphering how local energy fluxes control the collective phenomena is still largely an open challenge. We provide generic relations between the activity-induced dissipation and the transport properties of an internal tracer. By exploiting a mapping between active fluctuations and disordered driving, our results reveal how the local dissipation, at the basis of self-propulsion, constrains internal transport by reducing the mobility and the diffusion of particles. Then, we employ techniques of large deviations to investigate how interactions are affected when varying dissipation. This leads us to shed light on a microscopic mechanism to promote clustering at low dissipation, and we also show the existence of collective motion at high dissipation. Overall, these results illustrate how tuning dissipation provides an alternative route to phase transitions in active fluids.