Evolution of the unitary Bose gas for broad to narrow Feshbach resonances
arXiv:2202.05109 · doi:10.1103/PhysRevA.106.013315
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.
arXiv comment15 pages, 8 figures
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