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.-K., Pattinson, R., Billam, T., Gardiner, S., Cornish, S., Huang, T.-M., Lin, W.-W., Gou, S.-C., Parker, N., & 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: 2469-9926
• Electronic ISSN: 2469-9934
• 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