Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 28: Ultracold Atoms, Ions and BEC II (with A)
Q 28.1: Vortrag
Dienstag, 24. März 2015, 14:30–14:45, C/HSW
Structural transitions of nearly second order in classical dipolar gases — •Florian Cartarius1,2,3, Giovanna Morigi3, and Anna Minguzzi1,2 — 1Laboratoire de Physique et Modélisation des Milieux Condensés, Université Grenoble Alpes, F-38000 Grenoble, France — 2Laboratoire de Physique et Modélisation des Milieux Condensés, CNRS, F-38000 Grenoble, France — 3Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken, Germany
Particles with repulsive power-law interactions undergo a transition from a single to a double chain (zigzag) by decreasing the confinement in the transverse direction. We theoretically characterize this transition when the particles are classical dipoles, polarized perpendicularly to the plane in which the motion occurs, and argue that this transition is of first order, even though weakly. The nature of the transition is determined by the coupling between transverse and axial modes of the chain and contrasts with the behavior found in Coulomb systems, where the linear-zigzag transition is continuous and belongs to the universality class of the ferromagnetic transition. Our results hold for classical systems with power-law interactions 1/rα when α>2 and show that structural transitions in dipolar systems and Rydberg atoms can offer a test bed for simulating the critical behavior of magnets with lattice coupling.