Active particle dynamics beyond the jamming density

Journal article (2019)

Authors

Daniel R. McCusker Kavli institute of nanoscience Delft, Student
R. van Drongelen Kavli institute of nanoscience Delft, BN/Timon Idema Lab - AS
T. Idema BN/Timon Idema Lab - AS , Kavli institute of nanoscience Delft
Research Group
BN/Timon Idema Lab (AS) (TU Delft)
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Published Date

2019

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

BN/Bionanoscience

Research Group

BN/Timon Idema Lab

Abstract

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.