In the presence of an obstacle, active particles condensate into a surface "wetting" layer due to persistent motion. If the obstacle is asymmetric, a rectification current arises in addition to wetting. Asymmetric geometries are therefore commonly used to concentrate microorganisms like bacteria and sperms. However, most studies neglect the fact that biological active matter is diverse, composed of individuals with distinct self-propulsions. Using simulations, we study a mixture of "fast" and "slow" active Brownian disks in two dimensions interacting with large half-disk obstacles. With this prototypical obstacle geometry, we analyze how the stationary collective behavior depends on the degree of self-propulsion "diversity," defined as proportional to the difference between the self-propulsion speeds, while keeping the average self-propulsion speed fixed. A wetting layer rich in fast particles arises. The rectification current is amplified by speed diversity due to a superlinear dependence of rectification on self-propulsion speed, which arises from cooperative effects. Thus, the total rectification current cannot be obtained from an effective one-component active fluid with the same average self-propulsion speed, highlighting the importance of considering diversity in active matter.

Mauricio Rojas-Vega

Pablo de Castro

Rodrigo Soto

The European physical journal. E, Soft matter

EPJ E 发表的论文描述了在理解软、液体和生命系统的物理方面取得的进展。软物质是一大类凝聚的、通常是异质的系统（通常也称为复杂流体）的通用术语，它们显示出很大的响应到微弱的外部扰动，并具有由缓慢的内部动力学控制的特性。流动物质是指实际上可以流动的所有系统，从简单到多相液体，从泡沫到颗粒物质。生命物质涉及从对宇宙的新见解中出现的新物理学生命系统的特性和行为。此外，它旨在开发用于研究生物现象的新概念和定量方法。软物质物理学和统计物理学的方法在这项研究中发挥着关键作用。该期刊包括实验、计算和理论研究的报告，并吸引了广泛的跨学科社区，包括物理学、化学、生物学、数学和材料科学。

The European Physical Journal E publishes papers that explore recent advances in understanding the physics of soft matter, liquids, and living systems. Soft matter refers to a class of condensed, often heterogeneous systems, commonly known as complex fluids. These systems exhibit significant responses to weak external perturbations and possess characteristics governed by slow internal dynamics. Liquid matter encompasses all systems that can flow, ranging from simple liquids to multiphase liquids, from foams to granular materials. Living matter involves the properties and behaviors of new physical systems that arise from fresh insights into the universe. Furthermore, the journal aims to develop new concepts and quantitative methods for studying biological phenomena. Methods from soft matter physics and statistical physics play a crucial role in this research. The journal includes reports of experimental, computational, and theoretical studies, attracting a broad interdisciplinary community from physics, chemistry, biology, mathematics, and materials science.

《European Physical Journal E》发表的论文探讨了在理解软物质、液体和生命系统物理方面的最新进展。软物质是指一类凝聚态、通常异质的系统，通常被称为复杂流体。这些系统对微弱的外部扰动表现出显著的响应，并具有由缓慢的内部动力学所控制的特性。流动物质涵盖了所有可以流动的系统，从简单的液体到多相液体，从泡沫到颗粒物质。生命物质则涉及从对宇宙的新见解中所衍生的新物理学特性和生命系统的行为。此外，本期刊旨在开发用于研究生物现象的新概念和定量方法。软物质物理学和统计物理学的方法在这些研究中发挥着关键作用。该期刊包括实验、计算和理论研究的报告，吸引了来自物理学、化学、生物学、数学和材料科学等多个学科的广泛社区。

European Physical Journal E

Eur Phys J E Soft Matter

Mixtures of self-propelled particles interacting with asymmetric obstacles.

This work studies a mixture of “fast” and “slow” active Brownian disks in two dimensions interacting with large half-disk obstacles and analyzes how the stationary collective behavior depends on the degree of self-propulsion “diversity,” defined as proportional to the difference between the self- Propulsion speeds, while keeping the average self-Propulsion speed fixed.

Category	Quartile
物理与天体物理	4
物理与天体物理, 物理化学	4
物理与天体物理, 材料科学综合	4
物理与天体物理, 物理应用	4
物理与天体物理, 高分子科学	4

Mixtures of self-propelled particles interacting with asymmetric obstacles.

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Journal Info

Category	Quartile
POLYMER SCIENCE	3