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Bulletin of the American Physical Society

Efimov physics in an ultracold Bose-Fermi gas of 40 K and 87 Rb atoms

Ming-Guang Hu, Ruth Bloom, Tyler D. Cumby, George Kotula, Deborah Jin

Published Mar 4, 2014• 0 citations
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Tests of Universal Three-Body Physics in an Ultracold Bose-Fermi Mixture

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Recent measurements of Efimov resonances for 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 40K and 87Rb atoms. We find an Efimov-like resonance in the rate of inelastic collisions between 40K87Rb Feshbach molecules and 87Rb 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 41K and 87Rb mixture as well as to recent predictions.

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Few-body collisions in a quantum gas mixture of 40K and 87Rb atoms

Ruth Bloom

This thesis describes experiments on few-body interactions in a mixture of ultracold bosonic 87Rb and fermionic 40K atoms. Ultracold atoms are celebrated as a platform to explore fundamental quantum physics because their internal states, external potentials, and interactions with each other can be controlled by straightforward electrical and optical tools. In the case of Bose-Fermi mixtures, control comes at the cost of stability when strong interactions give rise to inelastic collisions that destroy the atomic samples. I present detailed measurements of the cross sections for these inelastic processes and discuss how they fit into an emerging pattern of resonances that is leading to better models of few-atom interactions. These phenomena have their roots in universal Efimov physics, which is a paradigm of quantum three-body interactions that was originally inspired by exotic nuclear states. I also discuss several methods to control the formation of KRb Feshbach molecules within the finite lifetime of the interacting K and Rb atomic mixture.

•Jan 1, 2014•1 citation
Recent measurements of Efimov resonances for 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 40K and 87Rb atoms. We find an Efimov-like resonance in the rate of inelastic collisions between 40K87Rb Feshbach molecules and 87Rb 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 41K and 87Rb mixture as well as to recent predictions.
This thesis describes experiments on few-body interactions in a mixture of ultracold bosonic 87Rb and fermionic 40K atoms. Ultracold atoms are celebrated as a platform to explore fundamental quantum physics because their internal states, external potentials, and interactions with each other can be controlled by straightforward electrical and optical tools. In the case of Bose-Fermi mixtures, control comes at the cost of stability when strong interactions give rise to inelastic collisions that destroy the atomic samples. I present detailed measurements of the cross sections for these inelastic processes and discuss how they fit into an emerging pattern of resonances that is leading to better models of few-atom interactions. These phenomena have their roots in universal Efimov physics, which is a paradigm of quantum three-body interactions that was originally inspired by exotic nuclear states. I also discuss several methods to control the formation of KRb Feshbach molecules within the finite lifetime of the interacting K and Rb atomic mixture.