Two-Element Mixture of Bose and Fermi Superfluids

Abstract

We report on the production of a stable mixture of bosonic and fermionic superfluids composed of the elements ${}^{174}$Yb and ${}^6$Li which feature a strong mismatch in mass and distinct electronic properties. We demonstrate elastic coupling between the superfluids by observing the shift in dipole oscillation frequency of the bosonic component due to the presence of the fermions. The measured magnitude of the shift is consistent with a mean-field model and its direction determines the previously unknown sign of the interspecies scattering length to be positive. We also observe the exchange of angular momentum between the superfluids from the excitation of a scissors mode in the bosonic component through interspecies interactions. We explain this observation using an analytical model based on superfluid hydrodynamics.

5 pages, 3 figures, supplemental material (expanded in second version)

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Cited by in corpus (14)

• Observation of a Degenerate Fermi Gas Trapped by a Bose-Einstein Condensate
• Andreev-Bashkin effect in superfluid cold gases mixture
• Connecting few-body inelastic decay to many-body correlations: a weakly coupled impurity in a resonant Fermi gas
• Breathing Mode of a BEC Repulsively Interacting with a Fermionic Reservoir
• Coupled Dipole Oscillations of a Mass-Imbalanced Bose and Fermi Superfluid Mixture
• Towards Quantum Turbulence in Cold Atomic Fermionic Superfluids
• Two-photon photoassociation spectroscopy of the ${}^2{\Sigma }^{+}$ YbLi molecular ground state
• An impurity immersed in a double Fermi Sea
• Spectroscopic determination of magnetic-field-dependent interactions in an ultracold Yb(3P2)-Li mixture
• Collective dynamics of Fermi-Bose mixtures with an oscillating scattering length
• Mean-field vs RPA calculation of the energy of an impurity immersed in a spin 1/2 superfluid
• BEC immersed in a Fermi sea: Theory of static and dynamic behavior across phase separation
• Spin Hall mode in a trapped thermal Rashba gas
• Quantum Degenerate Mixtures of Cs and Yb