Evolution of the unitary Bose gas for broad to narrow Feshbach resonances

We study the post-quench dynamics of unitary Bose gases using a two-channel model, focusing on the effect of variations in the width of the Feshbach resonance due to density changes. We generally find that increasing the density leads to a corresponding increase in the production of closed channel m...

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Bibliographic Details
Published in:arXiv.org 2022-02
Main Authors: Ahmed-Braun, D J M, Musolino, S, Colussi, V E, S J J M F Kokkelmans
Format: Article
Language:English
Subjects:
Density
Depletion
Dimers
Two body problem
Online Access:Get full text
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Summary:We study the post-quench dynamics of unitary Bose gases using a two-channel model, focusing on the effect of variations in the width of the Feshbach resonance due to density changes. We generally find that increasing the density leads to a corresponding increase in the production of closed channel molecules, a decrease in the build up of quantum depletion and a transition from linear to quadratic early-time growth of the two-body contact as well as the condensed pair fraction. Motivated by the presence of closed-channel molecules in the unitary regime, we study the embedded two-body problem finding a transition from open to closed-channel dominated dimers due to many-body effects.
ISSN:2331-8422
DOI:10.48550/arxiv.2202.05109