Stability and Dynamics of Atom-Molecule Superfluids Near a Narrow Feshbach Resonance
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866909252662067200 |
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| author | Wang, Zhiqiang Wang, Ke Zhang, Zhendong Nagata, Shu Chin, Cheng Levin, K. |
| author_facet | Wang, Zhiqiang Wang, Ke Zhang, Zhendong Nagata, Shu Chin, Cheng Levin, K. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_01639 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Stability and Dynamics of Atom-Molecule Superfluids Near a Narrow Feshbach Resonance Wang, Zhiqiang Wang, Ke Zhang, Zhendong Nagata, Shu Chin, Cheng Levin, K. Quantum Gases Atomic Physics Quantum Physics 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. |
| title | Stability and Dynamics of Atom-Molecule Superfluids Near a Narrow Feshbach Resonance |
| topic | Quantum Gases Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2310.01639 |