Two-Body Contact Dynamics in a Bose Gas near a Fano-Feshbach Resonance
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.
Authors
- Félix Werner (ORCID: https://orcid.org/0000-0002-5631-9024)
- Jean Dalibard (ORCID: https://orcid.org/0000-0001-8469-3913)
- E. Uzan
- Alexandre Journeaux (ORCID: https://orcid.org/0009-0002-7947-5211)
- D. S. Petrov (ORCID: https://orcid.org/0000-0002-9715-4633)
- Raphael Lopes (ORCID: https://orcid.org/0000-0003-3877-8478)
- Maxime Lecomte (ORCID: https://orcid.org/0009-0009-1979-4991)
- Julie Veschambre
Institutions
- Université Paris-Sud (FR)
- Collège de France (FR)
- Université Paris Sciences et Lettres (FR)
- Université Paris-Saclay (FR)
- Laboratoire Kastler Brossel (FR)
- Sorbonne Université (FR)
- Laboratoire de Physique Théorique et Modèles Statistiques (FR)
- École Normale Supérieure (BI)
- Laboratoire Médiations (FR)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2026-01-26
- DOI
- https://doi.org/10.1103/prf8-3q27
- Primary Topic
- Cold Atom Physics and Bose-Einstein Condensates
- Type
- article
- Field-Weighted Citation Impact
- 0.00