Connecting few-body inelastic decay to many-body correlations: a weakly coupled impurity in a resonant Fermi gas

Abstract

We study three-body recombination in an ultracold Bose-Fermi mixture. We first show theoretically that, for weak inter-species coupling, the loss rate is proportional to Tan's contact. Second, using a 7 Li/ 6 Li mixture we probe the recombination rate in both the thermal and dual superfluid regimes. We find excellent agreement with our model in the BEC-BCS crossover. At unitarity where the fermion-fermion scattering length diverges, we show that the loss rate is proportional the 4/3 power of the fermionic density. Our results demonstrate that impurity-induced losses can be used as a quantitative probe of many-body correlations.

References in corpus (19)

• Many-Body Physics with Ultracold Gases
• Weakly bound dimers of fermionic atoms
• Strong dissipation inhibits losses and induces correlations in cold molecular gases
• Molecular Probe of Pairing in the BEC-BCS Crossover
• The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions
• Collisional stability of a three-component degenerate Fermi gas
• Verification of universal relations in a strongly interacting Fermi gas
• Atomic three-body loss as a dynamical three-body interaction
• Number of closed-channel molecules in the BEC-BCS crossover
• Measurement of the Homogeneous Contact of a Unitary Fermi gas
• Collisional stability of fermionic Feshbach molecules
• Precise determination of the structure factor and contact in a unitary Fermi gas
• Two-Element Mixture of Bose and Fermi Superfluids
• Study of Efimov physics in two nuclear-spin sublevels of 7Li
• Strongly correlated Bose gases
• Thermal equilibrium and efficient evaporation of an ultracold atom-molecule mixture
• Three-body recombination at vanishing scattering lengths in an ultracold Bose gas
• Suppression of molecular decay in ultracold gases without Fermi statistics
• Dynamics of Feshbach Molecules in an Ultracold Three-Component Mixture

Cited by in corpus (13)

• Spectral response and contact of the unitary Fermi gas
• Universal Scaling Laws in the Dynamics of a Homogeneous Unitary Bose Gas
• Contact and sum-rules in a near-uniform Fermi gas at unitarity
• Universal pair-polaritons in a strongly interacting Fermi gas
• Absence of heating in a uniform Fermi gas created by periodic driving
• Suppression of Unitary Three-body Loss in a Degenerate Bose-Fermi Mixture
• Universal van der Waals Force Between Heavy Polarons in Superfluids
• Observation of Anomalous Decay of a Polarized Three-Component Fermi Gas
• Universal quantum dynamics of Bose polarons
• Probing Goldstino excitation through the tunneling transport in a Bose-Fermi mixture with explicitly broken supersymmetry
• Three-body contact for fermions. I. General relations
• Temperature dependence of $p$-wave contacts in a harmonically trapped Fermi gas
• Hybrid-pair superfluidity in a strongly driven Fermi gas