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DY: Fachverband Dynamik und Statistische Physik
DY 32: Poster: Active Matter, Soft Matter, Fluids
DY 32.10: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster C
Phase Separation in Cycloactive Matter — •Theo Spornhauer1, Johannes Zierenberg1,2, and Benoît Mahault1 — 1Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — 2Institute for the Dynamics of Complex Systems, University of Göttingen, Göttingen, Germany
Living systems that generate activity from environmental resources are dependent on environmental conditions. In nature, these conditions are typically not static, but have a strong temporal profile, as seen for example in the day-night cycle that affects photosynthesis. Here, we numerically investigate the effect of cyclic activity variations in a minimal model of active Brownian particles, focusing in particular on how they affect the phenomenon of motility-induced phase separation (MIPS). Performing simulations at various driving amplitudes and frequencies, our results show that MIPS is robust to the introduction of cyclic activity. For cycles crossing the transition point, measures of phase separation exhibit a characteristic hysteresis, which we find to be most pronounced when the timescales associated with activity and cyclic driving are comparable. We also discuss how the geometric properties of MIPS clusters are affected by the presence of the cyclic drive.
Keywords: Self-propelled particles; Periodically driven system; Hysteresis; Non-equilibrium; Phase separation