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Self-propulsive active nematics
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DOI：10.1098/rsta.2024.0272.png)
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Abstract
En 中文
Increasing evidence suggests that active matter exhibits instances of mixed symmetry that cannot be fully described by either polar or nematic formalism. Here, we introduce a minimal model that integrates self-propulsion into the active nematic framework. Our linear stability analyses reveal how self-propulsion shifts the onset of instability, fundamentally altering the dynamical landscape. Numerical simulations confirm these predictions, showing that self-propulsion induces anti-hyperuniform, giant density fluctuations of topological defects, anomalous long-range order in vorticity and non-universal self-similar energy cascades. Notably, these long-range ordered states emerge within the active turbulence regime well before the transition to a flocking state. Additionally, our analyses highlight a non-monotonic dependence of self-organization on self-propulsion, with optimal states characterized by a peak in correlation length. These findings are relevant for understanding of active nematic systems that self-propel, such as migrating cell layers or swarming bacteria, and offer new avenues for designing synthetic systems with tailored collective behaviours, bridging the gap between active nematics and self-propulsive systems.This article is part of the theme issue 'Biological fluid dynamics: emerging directions'.
Keywords:
self-propulsion
active nematics
motility
active fluids
Journal
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3.7
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7.7K
Citations:
2.8W
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