Two-Body Contact Dynamics in a Bose Gas near a Fano-Feshbach Resonance
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866918392790777856 |
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| author | Journeaux, Alexandre Veschambre, Julie Lecomte, Maxime Uzan, Ethan Dalibard, Jean Werner, Félix Petrov, Dmitry S. Lopes, Raphael |
| author_facet | Journeaux, Alexandre Veschambre, Julie Lecomte, Maxime Uzan, Ethan Dalibard, Jean Werner, Félix Petrov, Dmitry S. Lopes, Raphael |
| contents | We investigate the real-time buildup of short-range correlations in a nondegenerate ultracold Bose gas near a narrow Fano-Feshbach resonance. Using rapid optical control, we quench the closed-channel molecular energy to resonance on submicrosecond timescales and track the evolution of the two-body contact through photodissociation losses. Repeated pulse sequences enhance sensitivity to early-time two-body losses and reveal long-lived coherence between atom pairs and molecular states. The observed dynamics are accurately reproduced by our dynamical two-channel zero-range theory, which explicitly accounts for the resonance's narrow width and finite closed-channel decay, establishing a predictive framework for correlation dynamics in quantum gases near Fano-Feshbach resonances. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_03567 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-Body Contact Dynamics in a Bose Gas near a Fano-Feshbach Resonance Journeaux, Alexandre Veschambre, Julie Lecomte, Maxime Uzan, Ethan Dalibard, Jean Werner, Félix Petrov, Dmitry S. Lopes, Raphael Quantum Gases Quantum Physics We investigate the real-time buildup of short-range correlations in a nondegenerate ultracold Bose gas near a narrow Fano-Feshbach resonance. Using rapid optical control, we quench the closed-channel molecular energy to resonance on submicrosecond timescales and track the evolution of the two-body contact through photodissociation losses. Repeated pulse sequences enhance sensitivity to early-time two-body losses and reveal long-lived coherence between atom pairs and molecular states. The observed dynamics are accurately reproduced by our dynamical two-channel zero-range theory, which explicitly accounts for the resonance's narrow width and finite closed-channel decay, establishing a predictive framework for correlation dynamics in quantum gases near Fano-Feshbach resonances. |
| title | Two-Body Contact Dynamics in a Bose Gas near a Fano-Feshbach Resonance |
| topic | Quantum Gases Quantum Physics |
| url | https://arxiv.org/abs/2509.03567 |