Realization of a strongly interacting Bose-Fermi mixture from a two-component Fermi gas

Abstract

We show the emergence of a strongly interacting Bose-Fermi mixture from a two-component Fermi mixture with population imbalance. By analyzing in situ density profiles of ${}^6$Li atoms in the BCS-BEC crossover regime we identify a critical interaction strength, beyond which all minority atoms pair up with majority atoms, and form a Bose condensate. This is the regime where the system can be effectively described as a boson-fermion mixture. We determine the dimer-fermion and dimer-dimer scattering lengths and beyond-mean-field contributions. Our study realizes a Gedanken experiment of bosons immersed in a Fermi sea of one of their constituents, revealing the composite nature of the bosons.

5 pages, 5 figures

References in corpus (6)

• Weakly bound dimers of fermionic atoms
• Phase diagram of a two-component Fermi gas with resonant interactions
• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
• Determination of the Equation of State of a Two-Component Fermi Gas at Unitarity
• Fermi-Fermi Mixtures in the Strong Attraction Limit

Cited by in corpus (5)

• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Dimer-dimer collisions at finite energies in two-component Fermi gases
• Generalized Mean Field Approach to a Resonant Bose-Fermi Mixture
• Density profiles of polarized Fermi gases confined in harmonic traps
• Polarized superfluids near their tricritical point