Defect-Mediated Phase Transitions in Active Soft Matter

Abstract

How do topological defects affect the degree of order in active matter? To answer this question we investigate an agent-based model of self-propelled particles, which accounts for polar alignment and short-ranged repulsive interactions. For strong alignment forces we find collectively moving polycrystalline states with fluctuating networks of grain boundaries. In the regime where repulsive forces dominate, the fluctuations generated by the active system give rise to quasi-long-range transitional order, but---unlike thermal system---without creating topological defects.

23 pages, 3+7 figures

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Cited by in corpus (25)

• Orientational order of motile defects in active nematics
• Tuned, driven, and active soft matter
• Assembly and Phase Transitions within Colloidal Crystals
• Patterning active materials with addressable soft interfaces
• Taming active turbulence with patterned soft interfaces
• Thermodynamic phases in two-dimensional active matter
• Dynamical mean-field theory and weakly non-linear analysis for the phase separation of active Brownian particles
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• A mesoscopic field theoretical approach for active systems
• Emergent smectic order in simple active particle models
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• Defects Superdiffusion and Unbinding in a 2D XY Model of Self-Driven Rotors
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• Long-range translational order and hyperuniformity in two-dimensional chiral active crystal
• Alignment Destabilizes Crystal Orders in Active Systems
• Active quantum flocks
• Gaussian theory for spatially distributed self-propelled particles
• Topological signatures of collective dynamics and turbulent-like energy cascades in apolar active granular
• Repulsive torques alone trigger crystallization of constant speed active particles
• Collective excitations in active solids featuring alignment interactions
• Bidirectional Zigzag Growth from Clusters of Active Colloidal Shakers