Observation of Efimov molecules created from a resonantly interacting Bose gas

Abstract

We convert a strongly interacting ultracold Bose gas into a mixture of atoms and molecules by sweeping the interactions from resonant to weak. By analyzing the decay dynamics of the molecular gas, we show that in addition to Feshbach dimers it contains Efimov trimers. Typically around 8\% of the total atomic population is bound into trimers, identified by their density-independent lifetime of about 100~$\mu$s. The lifetime of the Feshbach dimers shows a density dependence due to inelastic atom-dimer collisions, in agreement with theoretical calculations. We also vary the density of the gas across a factor of 250 and investigate the corresponding atom loss rate at the interaction resonance.

6 pages, 4 figures

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• Dynamics of three-body correlations in quenched unitary Bose gases
• Direct Measurements of Collisional Dynamics in Cold Atom Triads
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• From Efimov Physics to the Bose Polaron using Gaussian States
• Pinpointing Feshbach Resonances and Testing Efimov Universalities in ${}^{39}$K
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• Efimov States of Strongly Interacting Photons
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• Squeezing the Efimov effect
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• From few to many bosons inside the unitary window: a transition between universal to non-universal behavior
• Phase diagram for strong-coupling Bose polarons
• Color superfluidity of neutral ultra-cold fermions in the presence of color-flip and color-orbit fields
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• Early-time dynamics of Bose gases quenched into the strongly interacting regime
• Few-body quantum method in a $d$-dimensional space
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• A simplified approach to the repulsive Bose gas from low to high densities and its numerical accuracy
• Three-body forces and Efimov physics in nuclei and atoms
• Pair formation in quenched unitary Bose gases
• A coherent superposition of Feshbach dimers and Efimov trimers
• Harmonically Trapped Four-Boson System
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• Hyperspherical-LOCV Approximation to Resonant BEC
• Evolution of the unitary Bose gas for broad to narrow Feshbach resonances
• Interferometry of Efimov states in thermal gases by modulated magnetic fields
• Dynamical excitation processes and correlations of three-body two-dimensional mixtures
• Observation of a Halo Trimer in an Ultracold Bose-Fermi Mixture
• Fast in situ observation of atomic Feshbach resonances by photoassociative ionization
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• Long-lived trimers in a quasi-two-dimensional Fermi system
• Resonance triplet dynamics in the quenched unitary Bose gas
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• Quenched Magneto-association of Ultracold Feshbach Molecules
• Two-Step Production of Resonant Bose-Einstein Condensates
• Two-Body Contact Dynamics in a Bose Gas near a Fano-Feshbach Resonance
• Non-equilibrium dynamics and atom-pair coherence in strongly interacting Bose-Fermi mixtures
• Emergence of N-body tunable interactions in universal few-atom system
• Density effects on the interferometry of Efimov states by modulating magnetic fields
• Probing non-Gaussian correlations through entanglement generation in a many-body quantum system
• Delta-Kick Collimation of Heteronuclear Feshbach Molecules
• Interacting Bose-condensed gases