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arXiv · 0807.3306

Observation of an Efimov-like resonance in ultracold atom-dimer scattering

S. Knoop·F. Ferlaino·M. Mark·M. Berninger·H. Schoebel·H. -C. Naegerl·R. Grimm
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Abstract

The field of few-body physics has originally been motivated by understanding nuclear matter. New model systems to experimentally explore few-body quantum systems can now be realized in ultracold gases with tunable interactions. Albeit the vastly different energy regimes of ultracold and nuclear matter (peV as compared to MeV), few-body phenomena are universal for near-resonant two-body interactions. Efimov states represent a paradigm for universal three-body states, and evidence for their existence has been obtained in measurements of three-body recombination in an ultracold gas of caesium atoms. Interacting samples of halo dimers can provide further information on universal few-body phenomena. Here we study interactions in an optically trapped mixture of such halo dimers with atoms, realized in a caesium gas at nanokelvin temperatures. We observe an atom-dimer scattering resonance, which we interpret as being due to a trimer state hitting the atom-dimer threshold. We discuss the close relation of this observation to Efimov's scenario, and in particular to atom-dimer Efimov resonances.

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S. Knoop, F. Ferlaino, M. Mark, M. Berninger, H. Schoebel, H. -C. Naegerl, R. Grimm. 2008-07-21. Observation of an Efimov-like resonance in ultracold atom-dimer scattering. https://doi.org/10.1038/nphys1203

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