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arXiv 2007.12670cond-mat.stat-mechcond-mat.soft
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标量活性物质中无序诱导的长程关联

Disorder-Induced Long-Ranged Correlations in Scalar Active Matter

Sunghan Ro, Yariv Kafri, Mehran Kardar, Julien Tailleur

摘要:

我们研究了随机猝灭势和力矩对标量活性物质的影响。微观模拟表明,运动引起的相分离在二维中被替换为具有异常长程相关性和非零稳态电流的渐近均匀相。使用相结合的唯象模型和场论的治疗,我们表明存在一个较低的临界尺寸,$d_c=4$,低于该相分离,只有观察到小于一个Imry-Ma长度尺度的系统。我们确定了一个弱无序制度,其中的结构因子的规模为$S(q) \sim 1/q^2$,这占我们的数值。在$d=2$中,我们预测,在更大的尺度上,行为应该跨越到强无序状态。在$d>2$中,这两种状态根据势的强度而分别存在。

英文摘要:

We study the impact of a random quenched potentials and torques on scalar active matter. Microscopic simulations reveal that motility-induced phase separation is replaced in two-dimensions by an asymptotically homogeneous phase with anomalous long-ranged correlations and non-vanishing steady-state currents. Using a combination of phenomenological models and a field-theoretical treatment, we show the existence of a lower-critical dimension, $d_c=4$, below which phase separation is only observed for systems smaller than an Imry-Ma length-scale. We identify a weak-disorder regime in which the structure factor scales as $S(q) \sim 1/q^2$ which accounts for our numerics. In $d=2$ we predict that, at larger scales, the behaviour should cross over to a strong-disorder regime. In $d>2$, these two regimes exist separately, depending on the strength of the potential.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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