Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Active Matter A (joint session DY/CPP)

DY 3.4: Vortrag

Montag, 1. April 2019, 10:30–10:45, H20

Self-assembly of dipolar active Brownian particles in two dimensions — •Guo-Jun Liao and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin

We computationally study the self-assembly behavior of self-propelled Brownian particles with additional dipole-dipole interactions, stemming from a point dipole in the particle center. The propulsion direction of each particle is parallel to its dipole moment. At low densities and small dipolar coupling, the system undergoes a transition from a homogeneous state to a state with finite-sized (and orientationally disordered) clusters, when the particle motility is increased. Such cluster formation could be regarded as the asymptotic behavior of conventional active Brownian particles [1]. For strongly coupled dipolar colloids and zero motility, the model exhibits gel-like structures. On increasing particle motility, we observe a transition into a state with orientationally-ordered, finite-sized clusters. We analyze this state via the cluster size distribution and the net orientation. We also propose a mechanism to describe the emergence of such clusters.
Reference:

[1] G.-J. Liao and S. H. L. Klapp, Soft Matter 14, 7873 (2018)