Finite-temperature effects on a triatomic Efimov resonance in ultracold cesium

Abstract

We report a thorough investigation of finite-temperature effects on three-body recombination near a triatomic Efimov resonance in an ultracold gas of cesium atoms. Our measurements cover a wide range from a near-ideal realization of the zero-temperature limit to a strongly temperature-dominated regime. The experimental results are analyzed within a recently introduced theoretical model based on a universal zero-range theory. The temperature-induced shift of the resonance reveals a contribution that points to an energy-dependence of the three-body parameter. We interpret this contribution in terms of the finite range of the van der Waals interaction in real atomic systems and we quantify it in an empirical way based on length scale arguments. A universal character of the corresponding resonance shift is suggested by observations related to other Efimov resonances and the comparison with a theoretical finite-temperature approach that explicitly takes the van der Waals interaction into account. Our findings are of importance for the precise determination of Efimov resonance positions from experiments at finite temperatures.

8 pages, 5 figures

References in corpus (19)

• Observation of an Efimov spectrum in an atomic system
• Collisional stability of a three-component degenerate Fermi gas
• Three-body recombination in a three-state Fermi gas with widely tunable interactions
• Three-body recombination at large scattering lengths in an ultracold atomic gas
• Three-boson problem near a narrow Feshbach resonance
• Observation of universality in ultracold 7Li three-body recombination
• Observation of an Efimov-like resonance in ultracold atom-dimer scattering
• Evidence for Universal Four-Body States Tied to an Efimov Trimer
• Universal Properties of the Four-Body System with Large Scattering Length
• Observation of heteronuclear atomic Efimov resonances
• Observation of Efimov Resonances in a Mixture with Extreme Mass Imbalance
• Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields
• Limits on Universality in Ultracold Three-Boson Recombination
• Microscopic Origin and Universality Classes of the Efimov Three-Body Parameter
• Universal van der Waals Physics for Three Ultracold Atoms
• Efimov Physics and the Three-Body Parameter within a Two-Channel Framework
• Resonant atom-dimer collisions in cesium: Testing universality at positive scattering lengths
• Universality of weakly bound dimers and Efimov trimers close to Li-Cs Feshbach resonances
• The three-body parameter for Efimov states in lithium-6

Cited by in corpus (5)

• Heteronuclear Efimov scenario with positive intraspecies scattering length
• Pinpointing Feshbach Resonances and Testing Efimov Universalities in ${}^{39}$K
• Weakly bound LiHe${}_2$ molecules in the framework of three-dimensional Faddeev equations
• Lellouch-Lüscher relation for ultracold few-atom systems under confinement
• Finite-range bias in fitting three-body loss to the zero-range model