Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 10: Statistical Physics I (General)
DY 10.3: Vortrag
Montag, 12. März 2018, 10:30–10:45, BH-N 333
Optimal packing of confined dipolar hard spheres — •Florian Deißenbeck1, Hartmut Löwen1, and Erdal Celal Oguz2 — 1HHU Düsseldorf, Institut für Theoretische Physik 2: Weiche Materie — 2Tel Aviv University, School of Mechanical Engineering and The Sackler Center for Computational Molecular and Materials Science
We investigate the ground state of a classical two-dimensional system of hard-sphere dipoles confined between two hard walls. Using lattice sum minimization techniques we reveal that at fixed wall separations, a first-order transition from a vacuum to a straight one-dimensional chain of dipoles occurs upon increasing the line density. A further increase in this density yields the stability of an undulated chain with a nontrivial magnetic dipolar structure. By exploring the close-packed configurations of dipoles, which in general possess complex magnetizations, we find a novel phase structure that has a higher packing fraction than hitherto known ones. Our predictions serve as a guideline for experiments with granular dipolar and magnetic colloidal suspensions confined in slit-like geometry.