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

Year: 2022

Authors: Ahmed-Braun DJM., Musolino S., Colussi VE., Kokkelmans SJJMF.

Autors Affiliation: Eindhoven Univ Technol, POB 513, NL-5600 MB Eindhoven, Netherlands; Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy.

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.

Journal/Review: PHYSICAL REVIEW A

Volume: 106 (1)      Pages from: 13315-1  to: 13315-14

More 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.
KeyWords: Dynamics
DOI: 10.1103/PhysRevA.106.013315

Citations: 4
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