Stochastic growth dynamics and composite defects in quenched immiscible binary condensates

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

Abstract

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.

Citation

Liu, I., Pattinson, R., Billam, T., Gardiner, S., Cornish, S., Huang, T., …Proukakis, N. (2016). Stochastic growth dynamics and composite defects in quenched immiscible binary condensates. Physical Review A, 93(2), Article 023628. https://doi.org/10.1103/physreva.93.023628

• Journal Article Type: Article
• Acceptance Date: Dec 28, 2015
• Online Publication Date: Feb 18, 2016
• Publication Date: Feb 18, 2016
• Deposit Date: Feb 19, 2016
• Publicly Available Date: Feb 23, 2016
• Journal: Physical Review A
• Print ISSN: 1050-2947
• Electronic ISSN: 1094-1622
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 93
• Issue: 2
• Article Number: 023628
• DOI: https://doi.org/10.1103/physreva.93.023628
• Public URL: https://durham-repository.worktribe.com/output/1388058
• Related Public URLs: http://arxiv.org/abs/1408.0891