Collisions between tunable halo dimers: exploring an elementary four-body process with identical bosons

Abstract

We study inelastic collisions in a pure, trapped sample of Feshbach molecules made of bosonic cesium atoms in the quantum halo regime. We measure the relaxation rate coefficient for decay to lower-lying molecular states and study the dependence on scattering length and temperature. We identify a pronounced loss minimum with varying scattering length along with a further suppression of loss with decreasing temperature. Our observations provide insight into the physics of a few-body quantum system that consists of four identical bosons at large values of the two-body scattering length.

4 pages, 4 figures

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Cited by in corpus (34)

• Feshbach Resonances in Ultracold Gases
• Universal few-body physics and cluster formation
• Observation of an Efimov-like resonance in ultracold atom-dimer scattering
• Evidence for Universal Four-Body States Tied to an Efimov Trimer
• Formation and interactions of cold and ultracold molecules: new challenges for interdisciplinary physics
• Observation of interspecies Feshbach resonances in an ultracold Rb-Cs mixture
• Few-body physics in resonantly interacting ultracold quantum gases
• Magnetically Controlled Exchange Process in an Ultracold Atom-Dimer Mixture
• Ultracold three-body collisions near overlapping Feshbach resonances
• Feshbach resonances in ultracold 85Rb
• Bound states in a quasi-two-dimensional Fermi gas
• Momentum-space calculation of four-boson recombination
• Formation of molecular oxygen in ultracold O + OH reaction
• Resonant atom-dimer collisions in cesium: Testing universality at positive scattering lengths
• Efimov Trimer Formation via Ultracold Four-body Recombination
• Neutron${-}^{19}$C scattering near an Efimov state
• Reaction kinetics of ultracold molecule-molecule collisions
• Observation of interference between two molecular Bose-Einstein condensates
• Properties of universal bosonic tetramers
• Universality in bosonic dimer-dimer scattering
• A strongly interacting Bose gas: Nozières and Schmitt-Rink theory and beyond
• Molecular Collisions: from Near-cold to Ultra-cold
• Inelastic collisions of ultracold triplet Rb${}_{\text{2}}$ molecules in the rovibrational ground state
• Universal bosonic tetramers of dimer-atom-atom structure
• Collisions of Ultracold Trapped Cesium Feshbach Molecules
• Ultracold atom-dimer long-range interactions beyond the $1/R^n$ expansion
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• Universal Bound States of Two Particles in Mixed Dimensions or Near a Mirror
• Long-lived fermionic Feshbach molecules with tunable $p$-wave interactions
• Dimer-atom-atom recombination in the universal four-boson system
• Three-boson spectrum in the presence of 1D spin-orbit coupling: Efimov's generalized radial scaling law
• Observation of an Efimov resonance in an ultracold mixture of atoms and weakly bound dimers
• Repeated output coupling of ultracold Feshbach molecules from a Cs BEC
• Optically trapped Feshbach molecules of fermionic ${}^{161}$Dy and ${}^{40}$K: Role of light-induced and collisional losses