Calibration of Interaction Energy between Bose and Fermi Superfluids

Abstract

In this letter we study the interaction energy in a mixture of Bose and Fermi superfluids realized in recent cold atom experiment. On the Bose-Einstein-condensate (BEC) side of a Feshbach resonance between fermionic atoms, this interaction energy can be directly related to the scattering length between a bosonic atom and a dimer composed of fermions. We calculate the atom-dimer scattering length from a three-body analysis with both a zero-range model and a separable model including the van der Waals length scale, and we find significant deviation from the result given by a mean-field approach. We also find that the multiple scattering between atom and dimer can account for such a deviation. Our results provide a calibration to the mean-field interaction energy, which can be verified by measuring the shift of collective oscillation frequency.

10pages, 3 figures, including supplementary material

References in corpus (14)

• Weakly bound dimers of fermionic atoms
• The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions
• Three-boson problem near a narrow Feshbach resonance
• Realization of a strongly interacting Bose-Fermi mixture from a two-component Fermi gas
• Atom-Dimer Scattering in a Three-Component Fermi Gas
• Microscopic Origin and Universality Classes of the Efimov Three-Body Parameter
• Universal van der Waals Physics for Three Ultracold Atoms
• Contrasting the wide Feshbach resonances in ${}^6$Li and ${}^7$Li
• Atom-dimer scattering for confined ultracold fermion gases
• The Efimov effect in lithium 6
• Chandrasekhar-Clogston limit and critical polarization in a Fermi-Bose superfluid mixture
• Atom-Dimer Scattering and Stability of Bose and Fermi Mixtures
• Three-body problem in a two-dimensional Fermi gas
• Efimov Physics in Atom-Dimer Scattering of Lithium-6 Atoms

Cited by in corpus (6)

• Two-Element Mixture of Bose and Fermi Superfluids
• Polarons in Ultracold Fermi Superfluids
• Quasi-particle Lifetime in a Mixture of Bose and Fermi Superfluids
• Quantum droplet in a mixture of Bose-Fermi superfluids
• Vortex Lattices in the Bose-Fermi Superfluid Mixture
• Elementary excitations in the hybrid Bose-Fermi system induced by circularly polarized light in a two-dimensional gas of charge carriers with different masses