Observation of a Strong Atom-Dimer Attraction in a Mass-Imbalanced Fermi-Fermi Mixture

Abstract

We investigate a mixture of ultracold fermionic ${}^{40}$K atoms and weakly bound ${}^6$Li${}^{40}$K dimers on the repulsive side of a heteronuclear atomic Feshbach resonance. By radio-frequency spectroscopy we demonstrate that the normally repulsive atom-dimer interaction is turned into a strong attraction. The phenomenon can be understood as a three-body effect in which two heavy ${}^{40}$K fermions exchange the light ${}^6$Li atom, leading to attraction in odd partial-wave channels (mainly p-wave). Our observations show that mass imbalance in a fermionic system can profoundly change the character of interactions as compared to the well-established mass-balanced case.

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• Time-resolved observation of competing attractive and repulsive short-range correlations in strongly interacting Fermi gases
• Five-Body Efimov Effect and Universal Pentamer in Fermionic Mixtures
• Quantum mixtures of ultracold gases of neutral atoms
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• Thermometry of a deeply degenerate Fermi gas with a Bose-Einstein condensate
• High-temperature limit of the resonant Fermi gas
• Thermalization and Sub-Poissonian Density Fluctuations in a Degenerate Molecular Fermi Gas
• Calibration of Interaction Energy between Bose and Fermi Superfluids
• Reaction kinetics of ultracold molecule-molecule collisions
• High-temperature expansion for interacting fermions
• Universal clusters as building blocks of stable quantum matter
• Exploring ultracold collisions in ${}^6$Li-${}^{53}$Cr Fermi mixtures: Feshbach resonances and scattering properties of a novel alkali-transition metal system
• Quantum Monte Carlo study of mass-imbalanced Hubbard models
• Realization of a Cold Mixture of Fermionic Chromium and Lithium Atoms
• Theory of polariton-electron interactions in semiconductor microcavities
• Critical behaviour in one dimension: unconventional pairing, phase separation, BEC-BCS crossover and magnetic Lifshitz transition
• Lifetime of Feshbach dimers in a Fermi-Fermi mixture of ${}^6$Li and ${}^{40}$K
• Double-degenerate Fermi mixtures of ${}^6$Li and ${}^{53}$Cr atoms
• Stable p-wave resonant two-dimensional Fermi-Bose dimers
• Fast trimers in one-dimensional extended Fermi-Hubbard model
• Universal description of three two-component fermions
• An Adaptable Dual Species Effusive Source and Zeeman Slower Design Demonstrated with Rb and Li
• Exploring emergent heterogeneous phases in strongly repulsive Fermi gases
• Observation of low-field Feshbach resonances between ${}^{161}$Dy and ${}^{40}$K
• Few-body states of bosons interacting with a heavy quantum impurity
• Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures
• Quantum Coherent States of Interacting Bose-Fermi Mixtures in One Dimension
• Multiple phase separation in one-dimensional mixtures of mass- and population-imbalanced attractive Fermi gases
• Pairs, trimers and BCS-BEC crossover near a flat band: the sawtooth lattice
• Versatile Cold Atom Source for Multi-Species Experiments
• Thermally stable p-wave repulsive Fermi polaron without a two-body bound state
• Universality of Efimov states in highly mass-imbalanced cold-atom mixtures with van der Waals and dipole interactions
• Mass-imbalanced fermionic mixture in a harmonic trap
• Stability of $(N+1)$-body fermion clusters in multiband Hubbard model
• Three-body bound states in a harmonic waveguide with cylindrical symmetry
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Efimov physics beyond three particles
• Universal clusters in quasi-two-dimensional ultracold Fermi mixtures
• Interplay of mass imbalance and frustration in correlated band insulators
• Effect of mediated interactions on a Hubbard chain in mixed-dimensional fermionic cold atoms
• Mass-ratio condition for non-binding of three two-component particles with contact interactions
• Enhancing quantum order with fermions by increasing species degeneracy
• Equivalence of dissipative and dissipationless dynamics of interacting quantum systems with its application to the unitary Fermi gas