Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 40: Poster: Ultra-cold atoms, ions and BEC

A 40.6: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.V

Dark-bright ring solitons in Bose-Einstein condensates — •Jan Stockhofe¹, Panayotis G. Kevrekidis², Dimitri J. Frantzeskakis³, and Peter Schmelcher¹ — ¹Zentrum für Optische Quantentechnologien, Universität Hamburg, Deutschland — ²Department of Mathematics and Statistics, University of Massachusetts, USA — ³Department of Physics, University of Athens, Greece

We study dark-bright (DB) ring solitons in two-component Bose-Einstein condensates. In the limit of large densities of the dark component, we describe the soliton dynamics by means of an equation of motion for the ring radius. The presence of the bright, "filling" species is demonstrated to have a stabilizing effect on the ring dark soliton. Near the linear limit, we discuss the symmetry-breaking bifurcations of DB soliton stripes and vortex-bright soliton clusters from the DB ring and relate the stabilizing effect of filling to changes in the bifurcation diagram. Finally, we show that the stabilization by means of a second component is not limited to the radially symmetric structures, but can also be observed in a cross-like DB soliton configuration.