Pair formation in quenched unitary Bose gases
arXiv:1904.00908 · doi:10.1103/PhysRevA.100.013612
Abstract
We study a degenerate Bose gas quenched to unitarity by solving a many-body model including three-body losses and correlations up to second order. As the gas evolves in this strongly-interacting regime, the buildup of correlations leads to the formation of extended pairs bound purely by many-body effects, analogous to the phenomenon of Cooper pairing in the BCS regime of the Fermi gas. Through fast sweeps away from unitarity, we detail how the correlation growth and formation of bound pairs emerge in the fraction of unbound atoms remaining post sweep, finding quantitative agreement with experiment. We comment on the possible role of higher-order effects in explaining the deviation of our theoretical results from experiment for slower sweeps and longer times spent in the unitary regime.
References in corpus (7)
- Two and Three-body Contacts in the Unitary Bose Gas
- Adiabatic association of ultracold molecules via magnetic field tunable interactions
- Universal Scaling Laws in the Dynamics of a Homogeneous Unitary Bose Gas
- Bound-state signatures in quenched Bose-Einstein condensates
- Extracting the condensate density from projection experiments with Fermi gases
- Hyperbolic Bloch equations: atom-cluster kinetics of an interacting Bose gas
- Probing Fermionic Condensates by Fast-Sweep Projection onto Feshbach Molecules