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 after the 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.
| Original language | English |
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| Article number | 013612 |
| Number of pages | 9 |
| Journal | Physical Review A |
| Volume | 100 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 11 Jul 2019 |
Funding
The authors thank Christoph Eigen, Zoran Hadzibabic, and Robert P. Smith for inspiring discussion and for providing experimental data. We also acknowledge Thomas Secker, Paul Mestrom, and Denise Braun for useful discussion. This work is supported by Netherlands Organization for Scientific Research (NWO) under Grant No. 680-47-623.