Abstract
We study the postquench 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 buildup 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.
| Original language | English |
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| Article number | 013315 |
| Number of pages | 14 |
| Journal | Physical Review A |
| Volume | 106 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jul 2022 |
Bibliographical note
Funding Information:The authors thank Thomas Secker for supplying a full coupled-channels calculation data set in order to compute the momentum-space cutoff and acknowledge Paul Mestrom and Jing-Lun Li for useful discussions. D.J.M.A.-B, S.M. and S.J.J.M.F.K acknowledge financial support by the Netherlands Organisation for Scientific Research (NWO) under Grant No. 680-47-623. V.E.C. acknowledges financial support from Provincia Autonoma di Trento and the Italian MIUR under the PRIN2017 projectCEnTraL.
Funding
The authors thank Thomas Secker for supplying a full coupled-channels calculation data set in order to compute the momentum-space cutoff and acknowledge Paul Mestrom and Jing-Lun Li for useful discussions. D.J.M.A.-B, S.M. and S.J.J.M.F.K acknowledge financial support by the Netherlands Organisation for Scientific Research (NWO) under Grant No. 680-47-623. V.E.C. acknowledges financial support from Provincia Autonoma di Trento and the Italian MIUR under the PRIN2017 projectCEnTraL.