How Dissipation Constrains Fluctuations in Nonequilibrium Liquids: Diffusion, Structure, and Biased Interactions
How Dissipation Constrains Fluctuations in Nonequilibrium Liquids: Diffusion, Structure, and Biased Interactions
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DOI：
10.1103/physrevx.9.041026
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发表时间：
2018-08
影响因子：
12.5
通讯作者：
Laura Tociu;'Etienne Fodor;T. Nemoto;Suriyanarayanan Vaikuntanathan
中科院分区：
文献类型：
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作者：
Laura Tociu;'Etienne Fodor;T. Nemoto;Suriyanarayanan Vaikuntanathan
被驱动液体的动力学和结构通常具有恒温器中能量净耗散的特征。然而，由于驱动和粒子间相互作用之间的复杂相互作用，在多体系统中，准确地解开耗散如何改变集体效应仍然具有挑战性。{第一}，我们将显式粗粒化和随机微积分相结合，得到了驱动液体中扩散、密度关联和耗散之间的简单关系。基于这些结果，我们考虑了大偏差有偏差的系综，其中轨迹模仿了外部驱动器的影响。{偏置函数的选择取决于第一部分中导出的耗散与结构之间的联系。利用分析和计算技术，我们证明了有偏轨迹有效地以受控方式重新正常化相互作用，从而提供了驱动力如何导致空间组织的直观，与复杂的自组装具有潜在的相关性。总之，我们的结果显示了调谐耗散如何提供了一种改变液体和软材料的结构和动力学的途径。
The dynamics and structure of driven liquids generically hold the signature of the net dissipation of energy in the thermostat. Yet, disentangling precisely how dissipation changes collective effects remains challenging in many-body systems due to the complex interplay between driving and interparticle interactions. {First}, we combine explicit coarse-graining and stochastic calculus to obtain simple relations between diffusion, density correlations and dissipation in a driven liquid. Based on these results, we consider large-deviation biased ensembles where trajectories mimic the effect of an external drive. {The choice of the biasing function is informed by the connection between dissipation and structure derived in the first part. Using analytical and computational techniques, we show that biased trajectories effectively renormalizes interactions in a controlled manner, thus providing intuition on how driving forces can lead to spatial organization, with potential relevance for complex self-assembly. Altogether, our results show how tuning dissipation provides a route to alter the structure and dynamics of liquids and soft materials.