Erlangen 2018 – scientific programme

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A: Fachverband Atomphysik

A 42: Poster Session IIIb

A 42.5: Poster

Thursday, March 8, 2018, 16:15–18:15, Zelt Ost

Quench-induced phase separation dynamics in a many-body multi-component Bose-Einstein condensate — •Garyfallia Katsimiga¹, Simeon Mistakidis¹, Panagiotis Kevrekidis², and Peter Schmelcher^1,3 — ¹Zentrum für optische Quantentechnologien Luruper Chaussee 149 22761 Hamburg — ²Department of Mathematics and Statistics, University of Massachusetts Amherst, Amherst, MA 01003-4515, USA — ³The Hamburg Centre for Ultrafast Imaging, Universitat Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

We examine the quenched dynamics of a binary Bose-Einstein condensate crossing the miscibility-immiscibility threshold and vice versa, both within and beyond the mean-field approximation. Increasing the interspecies repulsion leads to the filamentation of the density of each component, involving shorter wavenumbers (and longer spatial scales) in the many-body approach. These filaments appear to be strongly correlated both at the one- and the two-body level, exhibiting domain-wall structures. Furthermore, following the reverse quench process dark-bright soliton trains are spontaneously generated and subsequently found to decay in the many-body scenario. We utilize single-shot images to provide a clean experimental realization of our current findings via which the filamentation process is clearly captured. To expose further the many-body nature of the observed dynamics direct measurements of the variance of single-shots are performed, verifying the presence of fragmentation but also the entanglement between the species.