Reshaped Three-Body Interactions and the Observation of an Efimov State in the Continuum
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| Format: | Preprint |
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2023
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| _version_ | 1866910360036966400 |
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| author | Yudkin, Yaakov Elbaz, Roy D'Incao, José P. Julienne, Paul S. Khaykovich, Lev |
| author_facet | Yudkin, Yaakov Elbaz, Roy D'Incao, José P. Julienne, Paul S. Khaykovich, Lev |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_06237 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Reshaped Three-Body Interactions and the Observation of an Efimov State in the Continuum Yudkin, Yaakov Elbaz, Roy D'Incao, José P. Julienne, Paul S. Khaykovich, Lev Quantum Gases Atomic Physics Quantum Physics 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. |
| title | Reshaped Three-Body Interactions and the Observation of an Efimov State in the Continuum |
| topic | Quantum Gases Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2308.06237 |