Reshaped Three-Body Interactions and the Observation of an Efimov State in the Continuum

• URL: http://arxiv.org/abs/2308.06237v2
• Date: Sat, 9 Mar 2024 20:15:21 GMT
• Title: Reshaped Three-Body Interactions and the Observation of an Efimov State in the Continuum
• Authors: Yaakov Yudkin, Roy Elbaz, Jos\'e P. D'Incao, Paul S. Julienne, Lev Khaykovich
• Abstract summary: Efimov trimers are exotic three-body quantum states that emerge from the different types of three-body continua. We find that the $7$Li Efimov trimer does not immediately dissociate when passing the threshold. We identify this behavior with a universal phenomenon related to the emergence of a repulsive interaction in the atom-dimer channel.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 $^7$Li atoms using a narrow two-body Feshbach resonance. Contrary to the expectation, we find that the $^7$Li 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 $^7$Li Efimov states and provide a path to understand various puzzling phenomena associated with them.

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