Two-Body Contact Dynamics in a Bose Gas near a Fano-Feshbach Resonance

• URL: http://arxiv.org/abs/2509.03567v1
• Date: Wed, 03 Sep 2025 17:55:02 GMT
• Title: Two-Body Contact Dynamics in a Bose Gas near a Fano-Feshbach Resonance
• Authors: Alexandre Journeaux, Julie Veschambre, Maxime Lecomte, Ethan Uzan, Jean Dalibard, Félix Werner, Dmitry S. Petrov, Raphael Lopes,
• Abstract summary: We investigate the real-time buildup of short-range correlations in a nondegenerate ultracold Bose gas near a narrow Fano-Feshbach resonance.<n>We track the evolution of the two-body contact through photo-dissociation losses.
• Score: 32.505127447635864
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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 sub-microsecond timescales and track the evolution of the two-body contact through photo-dissociation 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.

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