Universal three-body parameter in ultracold 4He*

Abstract

We have analyzed our recently-measured three-body loss rate coefficient for a Bose-Einstein condensate of spin-polarized metastable triplet 4He atoms in terms of Efimov physics. The large value of the scattering length for these atoms, which provides access to the Efimov regime, arises from a nearby potential resonance. We find the loss coefficient to be consistent with the three-body parameter (3BP) found in alkali-metal experiments, where Feshbach resonances are used to tune the interaction. This provides new evidence for a universal 3BP, the first outside the group of alkali-metal elements. In addition, we give examples of other atomic systems without Feshbach resonances but with a large scattering length that would be interesting to analyze once precise measurements of three-body loss are available.

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• Universality of the three-body Efimov parameter at narrow Feshbach resonances
• Comparing and contrasting nuclei and cold atomic gases
• Microscopic Origin and Universality Classes of the Efimov Three-Body Parameter
• Finite range corrections near a Feshbach resonance and their role in the Efimov effect
• Few-body physics in resonantly interacting ultracold quantum gases
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• Universality and scaling in the $N$-body sector of Efimov physics
• Efimov States of Heavy Impurities in a Bose-Einstein Condensate
• Mass-imbalanced Three-Body Systems in Two Dimensions
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• Weakly bound states of two- and three-boson systems in the crossover from two to three dimension
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• Squeezing the Efimov effect
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• Few-body Physics in a Many-body World
• Finite Range Effects in Energies and Recombination Rates of Three Identical Bosons
• Three-body recombination at finite energy within an optical model
• Van der Waals universality in homonuclear atom-dimer elastic collisions
• Spectral flow of trimer states of two heavy impurities and one light condensed boson
• Efimov states in Li-Cs mixtures within a minimal model
• Calculations of long-range three-body interactions for He($n_0{}^{\lambda }S$)-He($n_0{}^{\lambda }S$)-He($n_0^{\prime }{}^{\lambda }L$)
• Shallow Trimers of Two Identical Fermions and One Particle in Resonant Regimes
• Two- and three- dimensional few-body systems in the universal regime