Suppression and revival of Floquet-Feshbach resonances

Resonant scattering is central in atomic, molecular, and optical physics and provides a powerful tool for controlling interactions in ultracold quantum gases. In ultracold atomic systems, magnetically tunable Feshbach resonances enable precise control over interaction strengths. Building on our recent demonstration that periodic magnetic-field modulation Floquet-engineers additional Feshbach resonances in an ultracold gas [A. Guthmann et al., Sci. Adv. 11, eadw3856 (2025)], we investigate how these resonances can be suppressed and revived by varying the drive. We map the resonance behavior versus modulation amplitude and frequency and identify a characteristic Bessel-function dependence, where the Bessel order matches the photon order of the Floquet-Feshbach resonance. This Bessel scaling controls how the widths and amplitudes of the individual resonances evolve with drive strength, providing a simple knob to enhance or suppress selected resonances. Our results give direct insight into Floquet-induced scattering dynamics and establish a practical route to tailoring atomic interactions for quantum simulation of complex many-body systems.