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DY: Fachverband Dynamik und Statistische Physik

DY 24: Dynamics and Statistical Physics - Open Session

DY 24.3: Talk

Tuesday, March 23, 2021, 11:40–12:00, DYb

Athermal Clustering and Jamming of Active Particles — •Michael Schmiedeberg — Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

In simulations of overdamped, repulsive, active particles in two dimensions at zero temperature the formation of clusters is observed. Note that it is not the temperature (as for mobility-induced phase transitions in thermal systems) but the unjamming dynamics that competes with the activity.

To be specific, large clusters that are even jammed in the inside only occur for intermediate activities. Decreasing the activity unjams the system and increasing the activity breaks up the clusters. Our simulations are in agreement with our results in [1], where athermal clustering has been studied in three dimensions in a simplified model system.

Our results demonstrate that even in the absence of thermal fluctuations a complex clustering behavior can be observed in active systems. An interesting task for future works will be to further compare the relation between the athermal clustering and mobility-induced phase transitions in thermal systems to the relation between athermal jamming and thermal jamming.

[1] M. Maiti and M. Schmiedeberg, EPL 126, 46002 (2019).