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

• URL: http://arxiv.org/abs/2202.05109v1
• Date: Thu, 10 Feb 2022 15:56:35 GMT
• Title: Evolution of the unitary Bose gas for broad to narrow Feshbach resonances
• Authors: D.J.M. Ahmed-Braun, S. Musolino, V. E. Colussi, S. J. J. M. F. Kokkelmans
• Abstract summary: We study the post-quench dynamics of unitary Bose gases using a two-channel model. We find that increasing the density leads to a corresponding increase in the production of closed channel molecules.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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