Dresden 2014 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Pattern Formation

DY 21.4: Vortrag

Mittwoch, 2. April 2014, 15:45–16:00, HÜL 186

Collective behaviour of shifted dipoles in external fields — •Arzu Bahar Yener and Sabine H. L. Klapp — Hardenbergstr. 36, 10623 Berlin, Germany

A colloidal system of spherical particles with centred dipolar mo- ments show self-organisation to layered structures in the presence of an external rotating magnetic field [1]. This non-equilibrium phenomenon requires synchronised motion of the particles with each other and with the driving field [1].

We investigate a model system of spherical particles carrying perma- ment dipole moments shifted out of the centres of mass and interacting by a soft core potential and a point dipole potential. Such system can be used to model experimentally created particles with magnetic caps [2] or Janus particles [3]. We aim to describe the non-equilibrium be- haviour of the system in external rotating magnetic fields, using molec- ular dynamics simulations. We present groundstate structures of the shifted dipolar system as well as simulation results in the presence or absence of external magnetic fields. [1] S. Jäger, and S. H. L. Klapp, Soft Matter 7, 6606 (2011) [2] D. Zerrouki, J. Baudry, D. Pine, P. Chaikin, and J. Bibette, Nature 455, 380 (2008) [3] J. Yan, M. Bloom, S. C. Bae, E. Luijten, and S. Granick, Nature 491, 578 (2012)