Tests of universal three-body physics in an ultracold Bose-Fermi mixture

Abstract

Recent measurements of Efimov resonances in a number of ultracold atom species have revealed an unexpected universality, in which three-body scattering properties are determined by the van der Waals length of the two-body interaction potential. To investigate whether this universality extends to heteronuclear mixtures, we measure loss rate coefficients in an ultracold trapped gas of ${}^{40}$K and ${}^{87}$Rb atoms. We find an Efimov-like resonance in the rate of inelastic collisions between ${}^{40}$K${}^{87}$Rb Feshbach molecules and ${}^{87}$Rb atoms. However, we do not observe any Efimov-related resonances in the rates of inelastic collisions between three atoms. These observations are compared to previous measurements by the LENS group of Efimov resonances in a ${}^{41}$K and ${}^{87}$Rb mixture as well as to recent predictions.

5 pages, 3 figures

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• Observation of an Efimov spectrum in an atomic system
• Collisional stability of a three-component degenerate Fermi gas
• Three-body recombination in a three-state Fermi gas with widely tunable interactions
• Observation of an Efimov-like resonance in ultracold atom-dimer scattering
• Observation of heteronuclear atomic Efimov resonances
• Interaction-driven Dynamics of 40K / 87Rb Fermi-Bose Gas Mixtures in the Large Particle Number Limit
• Collisional stability of fermionic Feshbach molecules
• Comparing and contrasting nuclei and cold atomic gases
• Control of the interaction in a Fermi-Bose mixture
• Limits on Universality in Ultracold Three-Boson Recombination
• Atom-Dimer Scattering in a Three-Component Fermi Gas
• Universal three-body parameter in heteronuclear atomic systems
• Observation of interspecies Li-Cs Feshbach resonances
• Ultracold mixtures of atomic Li-6 and Cs-133 with tunable interactions
• Feshbach resonances in mixtures of ultracold ${}^6$Li and ${}^{87}$Rb gases
• Accurate near-threshold model for ultracold KRb dimers from interisotope Feshbach spectroscopy
• Range Corrections to Three-Body Observables near a Feshbach Resonance
• Efimov Physics and the Three-Body Parameter within a Two-Channel Framework
• Collisional properties of weakly bound heteronuclear dimers
• Quantum Defect Theory for High Partial Wave Cold Collisions
• Feshbach molecule formation in a Bose-Fermi mixture
• Resonant Atom-Dimer Relaxation in Ultracold Atoms

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• Few-body physics in resonantly interacting ultracold quantum gases
• Visualizing Efimov Correlations in the Bose Polaron
• Transition from a polaronic condensate to a degenerate Fermi gas of heteronuclear molecules
• Observation of the Efimovian Expansion in Scale Invariant Fermi Gases
• Observation of Efimov molecules created from a resonantly interacting Bose gas
• Precision Test of the Limits to Universality in Few-Body Physics
• Heteronuclear Efimov scenario with positive intraspecies scattering length
• Universal three-body physics in ultracold KRb mixtures
• Doublon dynamics and polar molecule production in an optical lattice
• Quantum mixtures of ultracold gases of neutral atoms
• Resonantly Interacting Fermi-Fermi Mixture of ${}^{161}$Dy and ${}^{40}$K
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• Three-body recombination in heteronuclear mixtures at finite temperature
• Observation of Efimov Universality across a Non-Universal Feshbach Resonance in \textsuperscript{39}K
• Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture
• Thermalization and Sub-Poissonian Density Fluctuations in a Degenerate Molecular Fermi Gas
• Resonant atom-dimer collisions in cesium: Testing universality at positive scattering lengths
• Role of the intraspecies scattering length in the Efimov scenario with large mass difference
• Pinpointing Feshbach Resonances and Testing Efimov Universalities in ${}^{39}$K
• The mixing-demixing phase diagram of ultracold heteronuclear mixtures in a ring trimer
• Looking for "avalanche-mechanism" loss at an atom-molecule Efimov resonance
• Condensed phase of Bose-Fermi mixtures with a pairing interaction
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• Universal Borromean Binding in Spin-Orbit Coupled Ultracold Fermi Gases
• Enhancing the Efimov correlation in Bose polarons with large mass imbalance
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• Suppression of Unitary Three-body Loss in a Degenerate Bose-Fermi Mixture
• Atom-Dimer Scattering and Stability of Bose and Fermi Mixtures
• Squeezing the Efimov effect
• Isotopic shift of atom-dimer Efimov resonances in K-Rb mixtures: Critical effect of multichannel Feshbach physics
• Inelastic collisions of ultracold triplet Rb${}_{\text{2}}$ molecules in the rovibrational ground state
• A quantum degenerate Bose-Fermi mixture of ${}^{41}$K and ${}^6$Li
• Enhanced association and dissociation of heteronuclear Feshbach molecules in a microgravity environment
• Finite-temperature effects on a triatomic Efimov resonance in ultracold cesium
• Damping of long wavelength collective modes in spinor Bose-Fermi mixtures
• Observation of low-field Feshbach resonances between ${}^{161}$Dy and ${}^{40}$K
• Three-body Physics in Strongly Correlated Spinor Condensates
• Efimov physics and universal trimer in spin-orbit coupled ultracold atomic mixtures
• Three in Many: Efimov physics in the presence of a Fermi sea
• An effective-field-theory analysis of Efimov physics in heteronuclear mixtures of ultracold atomic gases
• Probing the Efimov discrete scaling in atom-molecule collision
• Bose-Fermi mixtures in the molecular limit
• Observation of Dynamical Super Efimovian Expansion in a Unitary Fermi Gas
• Weakly bound Li He${}_2$ molecules
• Two- and three-body problem with Floquet-driven zero-range interactions
• Three-body systems in physics of cold atoms and halo nuclei
• D-dimensional three-body bound-state problem with zero range interactions
• Atom-dimer scattering in heteronuclear mixture with finite intra-species scattering length
• A multichannel hyperspherical model for Efimov physics with van der Waals interactions controlled by a Feshbach resonance
• Cold atom-dimer reaction rates with ${}^4$He, ${}^{6,7}$Li and ${}^{23}$Na
• Detection of NaRb Feshbach molecule by photodissociation
• Fano effect in an ultracold atom-molecule coupled system
• Efimov resonance position near a narrow Feshbach resonance in ${}^6$Li-${}^{133}$Cs mixture
• Universal Three-Body Parameter of Heavy-Heavy-Light systems with negative intraspecies scattering length
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• Temperature dependence of an Efimov resonance in ${}^{39}\mathrm{K}$
• Fermions meet two bosons -- the heteronuclear Efimov effect revisited
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