Association of Efimov trimers from a three-atom continuum

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Abstract

We develop an experimental technique for rf-association of Efimov trimers from three-atoms continuum. We apply it to probe the lowest accessible Efimov energy level in bosonic lithium in the region where strong deviations from the universal behavior are expected, and provide quantitative study of this effect. Position of the Efimov resonance at the atom-dimer threshold, measured with a different experimental technique, concurs with the rf-association results.

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Feshbach Resonances in Ultracold Gases

Eite Tiesinga, Paul Julienne, Rudolf Grimm … (2008)

Feshbach resonances are the essential tool to control the interaction between atoms in ultracold quantum gases. They have found numerous experimental applications, opening up the way to important breakthroughs. This Review broadly covers the phenomenon of Feshbach resonances in ultracold gases and their main applications. This includes the theoretical background and models for the description of Feshbach resonances, the experimental methods to find and characterize the resonances, a discussion of the main properties of resonances in various atomic species and mixed atomic species systems, and an overview of key experiments with atomic Bose-Einstein condensates, degenerate Fermi gases, and ultracold molecules.

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Collisional stability of a three-component degenerate Fermi gas

S. Jochim, T. Lompe, M Kohnen … (2008)

We report on the creation of a degenerate Fermi gas consisting of a balanced mixture of atoms in three different hyperfine states of \(^6\)Li. This new system consists of three distinguishable Fermions with different and tunable interparticle scattering lengths \(a_{12}\), \(a_{13}\) and \(a_{23}\). We are able to prepare samples containing \(5 \cdot 10^4\) atoms in each state at a temperature of about \(215 \)nK, which corresponds to \(T/T_F \approx 0.37\). We investigated the collisional stability of the gas for magnetic fields between 0 and 600 G and found a prominent loss feature at 130 G. From lifetime measurements we determined three-body loss coefficients, which vary over nearly three orders of magnitude.

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Observation of universality in ultracold 7Li three-body recombination

Lev Khaykovich, Servaas Kokkelmans, Noam Gross … (2009)

We report on experimental evidence of universality in ultracold 7Li atoms' three-body recombination loss in the vicinity of a Feshbach resonance. We observe a recombination minimum and an Efimov resonance in regions of positive and negative scattering lengths, respectively, which are connected through the pole of the Feshbach resonance. Both observed features lie deeply within the range of validity of the universal theory and we find that the relations between their properties, i.e. widths and locations, are in an excellent agreement with the theoretical predictions.