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Reshaped three-body interactions and the observation of an Efimov state in the continuum

Author

Listed:
  • Yaakov Yudkin

    (Bar-Ilan University)

  • Roy Elbaz

    (Bar-Ilan University)

  • José P. D’Incao

    (University of Colorado and NIST
    University of Colorado)

  • Paul S. Julienne

    (University of Maryland and NIST)

  • Lev Khaykovich

    (Bar-Ilan University)

Abstract

Efimov trimers are exotic three-body quantum states that emerge from the different types of three-body continua in the vicinity of two-atom Feshbach resonances. In particular, as the strength of the interaction is decreased to a critical point, an Efimov state merges into the atom-dimer threshold and eventually dissociates into an unbound atom-dimer pair. Here we explore the Efimov state in the vicinity of this critical point using coherent few-body spectroscopy in 7Li atoms using a narrow two-body Feshbach resonance. Contrary to the expectation, we find that the 7Li Efimov trimer does not immediately dissociate when passing the threshold, and survives as a metastable state embedded in the atom-dimer continuum. We identify this behavior with a universal phenomenon related to the emergence of a repulsive interaction in the atom-dimer channel which reshapes the three-body interactions in any system characterized by a narrow Feshbach resonance. Specifically, our results shed light on the nature of 7Li Efimov states and provide a path to understand various puzzling phenomena associated with them.

Suggested Citation

  • Yaakov Yudkin & Roy Elbaz & José P. D’Incao & Paul S. Julienne & Lev Khaykovich, 2024. "Reshaped three-body interactions and the observation of an Efimov state in the continuum," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46353-1
    DOI: 10.1038/s41467-024-46353-1
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    References listed on IDEAS

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    1. A. Goban & R. B. Hutson & G. E. Marti & S. L. Campbell & M. A. Perlin & P. S. Julienne & J. P. D’Incao & A. M. Rey & J. Ye, 2018. "Emergence of multi-body interactions in a fermionic lattice clock," Nature, Nature, vol. 563(7731), pages 369-373, November.
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