Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 52: Ultracold atoms, ions and BEC V (with A)
Q 52.5: Vortrag
Donnerstag, 20. März 2014, 17:30–17:45, BEBEL SR140/142
Finite size effects stabilize inhomogeneous structures — •Florian Cartarius1,2, Anna Minguzzi1, and Giovanna Morigi2 — 1Université Grenoble 1/CNRS, Laboratoire de Physique et de Modélisation des Milieux Condensés (UMR 5493), B.P. 166, 38042 Grenoble, France — 2Fachrichtung 7.1: Theoretische Physik, Universität des Saarlandes, D 66123 Saarbrücken, Germany
We consider classical dipolar particles in a planar geometry confined by a harmonic ring trap. Using a Basin-Hopping Monte Carlo method and analytical calculations we study the minimal energy configurations. We find that close to the linear to zigzag transition [1], the energy is minimized by inhomogeneous soliton-like configurations originating from the short-range character of dipolar interactions. We develop a long-wavelength model that takes into account the coupling between radial and axial modes and show that its solutions well account for the inhomogeneous structures. They generically emerge for power law interactions with 1/rα, when α > 1. The inhomogeneous structures are due to finite size effects, but are still present for systems with very large number of particles and are thus experimentally relevant.
[1] G. Birkl, S. Kassner, and H. Walther, Nature 357, 310 (1992)