Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 26: Poster Session II
A 26.4: Poster
Wednesday, March 8, 2017, 17:00–19:00, P OG1
Dark-bright Soliton Dynamics and Interactions Beyond the Mean-Field approximation — Garyfallia Katsimiga1, Georgios Koutentakis1,2, •Simeon Mistakidis1, Panagiotis Kevrekidis3, and Peter Schmelcher1,2 — 1Zentrum fuer Optische Quantentechnologien, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 3Department of Mathematics and Statistics, University of Massachusetts Amherst, Amherst, MA 01003-4515, USA
The dynamics of dark bright solitons beyond the mean-field approximation is investigated. We first examine the case of a single dark-bright soliton and its oscillations within a parabolic trap. Subsequently, we move to the setting of collisions, comparing the mean-field approximation to that involving multiple orbitals in both the dark and the bright component. Fragmentation is present and significantly affects the dynamics, especially in the case of slower solitons and in that of lower atom numbers. The employed multi-orbital approximation allows for bipartite entanglement between the distinguishable species to be also generically observed. The above mentioned interplay leads to the decay of the initial mean-field dark-bright solitons into fast and slow fragmented dark-bright structures. A variety of excitations including dark-bright solitons in multiple orbitals is observed. Dark-antidark states and domain wall-bright soliton complexes arise spontaneously possessing an important role in the interpretation of the dynamics.