Contact Measurements on Atomic BEC

Abstract

A powerful set of universal relations, centered on a quantity called the contact, connects the strength of short-range two-body correlations to the thermodynamics of a many-body system with delta-function interactions. We report on measurements of the contact, using RF spectroscopy, for an ${}^{85}$Rb atomic Bose-Einstein condensate (BEC). For bosons, the fact that contact spectroscopy can be used to probe the gas on short timescales is useful given the decreasing stability of BECs with increasing interactions. A complication is the added possibility, for bosons, of three-body interactions. In investigating this issue, we have located an Efimov resonance for ${}^{85}$Rb atoms with loss measurements and thus determined the three-body interaction parameter. In our contact spectroscopy, in a region of observable beyond-mean-field effects, we find no measurable contribution from three-body physics.

arXiv comment5 pages, 4 figures

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Cited by in corpus (200)

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• Origin of the Three-body Parameter Universality in Efimov Physics
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• Observation of the Second Triatomic Resonance in Efimov's Scenario
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• Two-dimensional dynamics of expansion of a degenerate Bose gas
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• General relations for quantum gases in two and three dimensions. II. Bosons and mixtures
• Lifetime of the Bose Gas with Resonant Interactions
• Universality of the three-body Efimov parameter at narrow Feshbach resonances
• Λ-enhanced Sub-Doppler Cooling of Lithium Atoms in D1 Gray Molasses
• Comparing and contrasting nuclei and cold atomic gases
• Tests of universal three-body physics in an ultracold Bose-Fermi mixture
• Two and Three-body Contacts in the Unitary Bose Gas
• Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields
• Generalized Hydrodynamics in the 1D Bose gas: theory and experiments
• Analyzing a Bose polaron across resonant interactions
• Stability of a unitary Bose gas
• Evidence for universal relations describing a gas with $p$-wave interactions
• Universal three-body parameter in heteronuclear atomic systems
• Efimov physics beyond universality
• Exact Numerical Results on the Ground State of Strongly Interacting Fermi Gases in Two Dimensions
• Few-body Bose gases in low dimensions -- a laboratory for quantum dynamics
• Few-body physics in resonantly interacting ultracold quantum gases
• Quenching to unitarity: Quantum dynamics in a 3D Bose gas
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• Efimov-driven phase transitions of the unitary Bose gas
• Supplementary information to "Efimov-driven phase transitions of the unitary Bose gas"
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• Efimov Physics in Quenched Unitary Bose Gases
• Energy and contact of the one-dimensional Fermi polaron at zero and finite temperature
• Observation of Efimov Universality across a Non-Universal Feshbach Resonance in \textsuperscript{39}K
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• Universal Trimers induced by Spin-Orbit Coupling in Ultracold Fermi Gases
• Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture
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• Feshbach Loss Spectroscopy in an Ultracold ${}^{23}$Na and ${}^{40}$K Mixture
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• Beyond-Luttinger-Liquid thermodynamics of a one-dimensional contact repulsive Bose gas
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• Resonant Floquet Scattering of Ultracold Atoms
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