Active particle dynamics beyond the jamming density

Kavli Affiliate: Timon Idema

| First 5 Authors: Daniel R. McCusker, Ruben van Drongelen, Timon Idema, ,

| Summary:

Many biological systems form colonies at high density. Passive granular
systems will be jammed at such densities, yet for the survival of biological
systems it is crucial that they are dynamic. We construct a phase diagram for a
system of active particles interacting via Vicsek alignment, and vary the
density, self-propulsion force, and orientational noise. We find that the
system exhibits four different phases, characterized by transitions in the
effective diffusion constant and in the orientational order parameter. Our
simulations show that there exists an optimal noise such that particles require
a minimal force to unjam, allowing for rearrangements.

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