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Ultracold three-body recombination and Efimov physics under partial confinement

José Paulo D'Incao, Yujun Wang, Brett D. Esry

Bulletin of the American Physical SocietyJun 9, 20150 citations

Extending universal three-body physics to finite energies: Efimov features for a<0

Yujun Wang, Brett D. Esry

APSMar 1, 20100 citations

Efimov effect for heteronuclear three-body systems at positive scattering length and finite temperature

Samuel B. Emmons, Daekyoung Kang, Bijaya Acharya +1 more

We study the recombination process of three atoms scattering into an atom and diatomic molecule in heteronuclear mixtures of ultracold atomic gases with large and positive interspecies scattering length at finite temperature. We calculate the temperature dependence of the three-body recombination rates by extracting universal scaling functions that parametrize the energy dependence of the scattering matrix. We compare our results to experimental data for the $^{40}\mathrm{K}\ensuremath{-}^{87}\mathrm{Rb}$ mixture and make a prediction for $^{6}\mathrm{Li}\ensuremath{-}^{87}\mathrm{Rb}$. We find that contributions from higher partial wave channels significantly impact the total rate and, in systems with particularly large mass imbalance, can even obliterate the recombination minima associated with the Efimov effect.We study the recombination process of three atoms scattering into an atom and diatomic molecule in heteronuclear mixtures of ultracold atomic gases with large and positive interspecies scattering length at finite temperature. We calculate the temperature dependence of the three-body recombination rates by extracting universal scaling functions that parametrize the energy dependence of the scattering matrix. We compare our results to experimental data for the $^{40}\mathrm{K}\ensuremath{-}^{87}\mathrm{Rb}$ mixture and make a prediction for $^{6}\mathrm{Li}\ensuremath{-}^{87}\mathrm{Rb}$. We find that contributions from higher partial wave channels significantly impact the total rate and, in systems with particularly large mass imbalance, can even obliterate the recombination minima associated with the Efimov effect.

arXiv:1706.09458Physical Review ASep 8, 20172 citations

Universal three-body physics at finite energy near Feshbach resonances

Yujun Wang, Brett D. Esry

We find that universal three-body physics extends beyond the threshold regime to non-zero energies. For ultracold atomic gases with a negative two-body s-wave scattering length near a Feshbach resonance, we show that the resonant peaks characteristic of Efimov physics persist in three-body recombination to higher collision energies. For this and other inelastic processes, we use the adiabatic hyperspherical representation to derive universal analytical expressions for their dependence on the scattering length, the collision energy and—for narrow resonances—the effective range. These expressions are supported by full numerical solutions of the Schrödinger equation and display log-periodic dependence on energy characteristic of Efimov physics. This dependence is robust and might be used to experimentally observe several Efimov features.We find that universal three-body physics extends beyond the threshold regime to non-zero energies. For ultracold atomic gases with a negative two-body s-wave scattering length near a Feshbach resonance, we show that the resonant peaks characteristic of Efimov physics persist in three-body recombination to higher collision energies. For this and other inelastic processes, we use the adiabatic hyperspherical representation to derive universal analytical expressions for their dependence on the scattering length, the collision energy and—for narrow resonances—the effective range. These expressions are supported by full numerical solutions of the Schrödinger equation and display log-periodic dependence on energy characteristic of Efimov physics. This dependence is robust and might be used to experimentally observe several Efimov features.

arXiv:1012.1422New Journal of PhysicsMar 29, 201120 citations

Beyond Universality in Three-Body Recombination

Chen Ji, Lucas Platter, Donna Phillips

Bulletin of the American Physical SocietyOct 9, 20100 citations

Three-body parameter for Efimov states in Li 6

Bo Huang, Kenneth M. O’Hara, Rudolf Grimm +2 more

A model for finite-temperature effects on three-body recombination in Efimov systems is presented and used to determine the three-body parameter for fermionic lithium-6, which may serve as a basis for future measurements in different systems in a search for nonuniversality in Efimov physics in atomic systems.

arXiv:1408.5258Physical Review AOct 30, 201425 citations

Extracting Efimov physics from three-body recombination at finite energies

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