Stochastic growth dynamics and composite defects in quenched immiscible binary condensates

I. K. Liu, R. W. Pattinson, T. P. Billam, S. A. Gardiner, S. L. Cornish, T. M. Huang, Wen-Wei Lin, S. C. Gou, N. G. Parker, N. P. Proukakis

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We study the sensitivity of coupled condensate formation dynamics on the history of initial stochastic domain formation in the context of instantaneously quenched elongated harmonically trapped immiscible two-component atomic Bose gases. The spontaneous generation of defects in the fastest condensing component, and subsequent coarse-graining dynamics, can lead to a deep oscillating microtrap into which the other component condenses, thereby establishing a long-lived composite defect in the form of a dark-bright solitary wave. We numerically map out diverse key aspects of these competing growth dynamics, focusing on the role of shot-to-shot fluctuations and global parameter changes (initial state choices, quench parameters, and condensate growth rates), with our findings also qualitatively confirmed by realistic finite-duration quenches. We conclude that phase-separated structures observable on experimental time scales are likely to be metastable states whose form is influenced by the stability and dynamics of the spontaneously emerging dark-bright solitary wave.

Original languageEnglish
Article number023628
JournalPhysical Review A
Issue number2
StatePublished - 18 Feb 2016


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