Regensburg 2022 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 46: Poster Session: Complex Fluids, Soft Matter, Active Matter, Glasses and Granular Materials

DY 46.21: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P2

Characterization and control of traffic-jam transition for self-propelled particles with q-fold discrete symmetry: The restricted Active Potts Model — •Swarnajit Chatterjee¹, Mintu Karmakar², Matthieu Mangeat¹, Heiko Rieger¹, and Raja Paul² — ¹Saarland University, Saarbrücken, Germany — ²Indian Association for the Cultivation of Science, Kolkata, India

We undertake comprehensive numerical simulations of the q-state active Potts model (APM) [EPL 130, 66001 (2020); Phys. Rev. E 102, 042601 (2020)] applying distinct volume exclusions to the self-propulsion of the active particles in the quest to explore the characteristics of the emerging phases, kinetic arrest, and jamming transitions. We broadly explore two scenarios where (a) the population of a lattice site is prearranged (hard-core restriction) and (b) particle movements are governed by a local repulsive field (soft-core restriction) and show that such effects lead to a surprisingly rich variety of self-organized spatial patterns. While bands and lanes of moving particles commonly occur without or under weak volume exclusion, strong volume exclusion along with low temperature, high activity, and large particle density facilitates traffic jams. Through a number of phase diagrams, we identify the phase boundaries separating the jammed and free-flowing phases and study the transition between these phases which provide us with both qualitative and quantitative predictions of how jamming might be delayed or dissolved. We further validate our numerical findings with a hydrodynamic model description.