Stability and Dynamics of Atom-Molecule Superfluids Near a Narrow Feshbach Resonance

• URL: http://arxiv.org/abs/2310.01639v2
• Date: Mon, 15 Jul 2024 02:21:17 GMT
• Title: Stability and Dynamics of Atom-Molecule Superfluids Near a Narrow Feshbach Resonance
• Authors: Zhiqiang Wang, Ke Wang, Zhendong Zhang, Shu Nagata, Cheng Chin, K. Levin,
• Abstract summary: Recent observations of a stable molecular condensate emerging from a condensate of bosonic atoms have raised an intriguing set of questions. We show one essential element behind these phenomena is an extremely narrow Feshbach resonance in $133$Cs at 19.849G.
• Score: 6.3012436412546595
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The recent observations of a stable molecular condensate emerging from a condensate of bosonic atoms and related "super-chemical" dynamics have raised an intriguing set of questions. Here we provide a microscopic understanding of this unexpected stability and dynamics in atom-molecule superfluids; we show one essential element behind these phenomena is an extremely narrow Feshbach resonance in $^{133}$Cs at 19.849G. Comparing theory and experiment we demonstrate how this narrow resonance enables the dynamical creation of a large closed-channel molecular fraction superfluid, appearing in the vicinity of unitarity. Theoretically the observed superchemistry (\textit{i.e.}, Bose enhanced reactions of atoms and molecules), is found to be assisted by the formation of Cooper-like pairs of bosonic atoms that have opposite momenta. Importantly, this narrow resonance opens the possibility to explore the quantum critical point of a molecular Bose superfluid and related phenomena which would not be possible near a more typically broad Feshbach resonance.

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