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Phase behaviour and dynamics of three-dimensional active dumbbell systems

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Caporusso, C.B.
Negro, G.
Suma, A.
Digregorio, P.
Gonnella G
Cugliandolo, L.F.

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We present a comprehensive numerical study of the phase behavior and dynamics of a three-dimensional active dumbbell system with attractive interactions. We demonstrate that attraction is essential for the system to exhibit nontrivial phases. We construct a detailed phase diagram by exploring the effects of the system's activity, density, and attraction strength. We identify several distinct phases, including a disordered, a gel, and a completely phase-separated phase. Additionally, we discover a novel dynamical phase, that we name percolating network, which is characterized by the presence of a spanning network of connected dumbbells. In the phase-separated phase we characterize numerically and describe analytically the helical motion of the dense cluster.

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Royal Society of Chemistry

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Active matter, Liquid crystal, Molecular dynamics

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Soft Matter

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10.1039/d3sm01030a

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