Year: 2026
Type: preprint
Abstract: Spatial confinement profoundly impacts the transport and self-organization of active matter across diverse biological systems. While the collective orders in confined active matter have been extensively characterized, how geometric constraints reshape near-field flows and the resulting inter-particle correlations remains largely unexplored. In this study, we combine experiments and hydrodynamic simulations to investigate inter-particle correlations within quasi-two-dimensional Chlamydomonas reinhardtii suspensions. We reveal two disentangled modes characterizing cell pairs: a dipolar mode and an entrainment mode, which exhibit a density- and distance-dependent competition. Combining single-cell flow field analysis, hydrodynamic simulations, and active-passive mixtures, we link these two modes to singular hydrodynamics and lubrication-induced entrainment. Our results demonstrate that spatiotemporal correlations in confined active matter are fundamentally rooted in the interplay of these two hydrodynamic mechanisms.
Source: arXiv (Cornell University)
Institution: The University of Tokyo
Topic: Micro and Nano Robotics
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1779040330, Challenge from mechanical self-organization to elucidate the physical properties of non-equilibrium soft matter / amorphous material, Counter-rotating active matter: How chirality propagates from microscopic dynamics to microscopic dynamics to macroscopic chirality, G3752857035, 高密度バクテリア集団によるアクティブマター物質相開拓, アクティブ乱流の３次元構造と制御方法の開拓, G5691674292, G5998584568, Squeezing active matter: Exploring low-dimensional properties in collective motion, 3次元トポロジカル欠陥が織りなすpassive/active液晶の時空間ダイナミクス:開拓と制御, G7360673865, G7649947944, G8948817295, Disorder-Induced Order and Function: Uncovering Principles of Long-Range Correlations in Active Matter through Bacterial Turbulence
OpenAlex ID: W7201831132
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