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.

14 pages, 13 figures

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Cited by in corpus (13)

• 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
• Harmonically trapped inertial run-and-tumble particle in one dimension
• Inertial Dynamics of Run-and-Tumble Particle
• Entropy production of active Brownian particles going from liquid to hexatic and solid phases
• Fluctuation Theorems for Heat exchanges between passive and active baths
• The coherent motions of thermal active Brownian particles
• Theory for the Anomalous Phase Behavior of Inertial Active Brownian Particles
• Improving estimation of entropy production rate for run-and-tumble particle systems by high-order thermodynamic uncertainty relation
• Hyperuniformity of Weighted Particle Systems