Many-body suppression of optically induced inelastic scattering in a weakly interacting Fermi gas near a Fano-Feshbach resonance

We derive a model to explain the observed suppression of optically induced loss in a weakly interacting Fermi gas as the $s$-wave scattering length is increased [C. A. Royse et al., Phys. Rev. Lett. 133, 083404 (2024)]. We incorporate spin-dependent loss into a quasiclassical collective spin vector model to show that loss suppression occurs via a transition to a magnetized dynamical state, where two-body $s$-wave scattering is inhibited via the Pauli principle. By comparing measurements in mixtures and coherently prepared samples, we show that the data are quantitatively explained by the model, which is applicable to the optical control of energy-space lattices for new quantum simulators.