Suppression of Unitary Three-body Loss in a Degenerate Bose-Fermi Mixture

Abstract

We study three-body loss in an ultracold mixture of a thermal Bose gas and a degenerate Fermi gas. We find that at unitarity, where the interspecies scattering length diverges, the usual inverse-square temperature scaling of the three-body loss found in non-degenerate systems is strongly modified and reduced with the increasing degeneracy of the Fermi gas. While the reduction of loss is qualitatively explained within the few-body scattering framework, a remaining suppression provides evidence for the long-range RKKY interactions mediated by fermions between bosons. Our model based on RKKY interactions quantitatively reproduces the data without free parameters, and predicts one order of magnitude reduction of the three-body loss coefficient in the deeply Fermi-degenerate regime.

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• Medium-induced bosonic clusters in a Bose-Fermi mixture: Towards simulating cluster formations in neutron-rich matter
• Long-lived fermionic Feshbach molecules with tunable $p$-wave interactions
• Interferometry of Efimov states in thermal gases by modulated magnetic fields
• Observation of a Halo Trimer in an Ultracold Bose-Fermi Mixture
• Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixtures
• Spectroscopic evidence for engineered hadron formation in repulsive fermionic $\text{SU}(N)$ Hubbard Models
• Mediated Interactions and Damping Effects in Superfluid Mixtures of Bose and Fermi Gases
• Mechanical stability of resonant Bose-Fermi mixtures
• Repulsive Fermi and Bose Polarons in Quantum Gases
• Mechanisms of anomalous three-body loss in a population-imbalanced three-component Fermi gas
• Density effects on the interferometry of Efimov states by modulating magnetic fields