Hydrodynamic effects on the liquid-hexatic transition of active colloids

Abstract

We study numerically the role of hydrodynamics in the liquid-hexatic transition of active colloids at intermediate activity, where motility induced phase separation (MIPS) does not occur. We show that in the case of active Brownian particles (ABP), the critical density of the transition decreases upon increasing the particle's mass, enhancing ordering, while self-propulsion has the opposite effect in the activity regime considered. Active hydrodynamic particles (AHP), instead, undergo the liquid-hexatic transition at higher values of packing fraction $\varphi$ than the corresponding ABP, suggesting that hydrodynamics have the net effect of disordering the system. At increasing densities, close to the hexatic-liquid transition, we found in the case of AHP the appearance of self-sustained organized motion with clusters of particles moving coherently.

arXiv comment14 pages, 13 figures

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• Role of rotational inertia for collective phenomena in active matter
• Dynamics of active particles with translational and rotational inertia
• Entropons as collective excitations in active solids
• Tuning Nonequilibrium Phase Transitions with Inertia
• Phase behaviour and dynamics of three-dimensional active dumbbell systems
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• Improving estimation of entropy production rate for run-and-tumble particle systems by high-order thermodynamic uncertainty relation
• Hyperuniformity of Weighted Particle Systems