(220d) Collective Dynamics of Dipolar and Multipolar Colloids: From Passive to Active Systems

In this talk I will present recent research on the collective dynamical behavior of colloids with dipolar or multipolar interactions. Starting from â??passiveâ? dipolar particles exhibiting network formation and various types of cluster aggregation, we will then move towards systems composed of dipolar â??microswimmersâ? with unidirectional propulsion. These systems display a transition towards a laned state reminiscent of lane formation in driven systems with isotropic repulsive interactions. We interpret our findings by a phase separation process and force balance arguments. Finally, we discuss first results on the collective behavior of dipolar particles with random self-propulsion.