Loosely Bound Few-Body States in a Spin-1 Gas with Near-Degenerate
Continua
- URL: http://arxiv.org/abs/2301.08097v1
- Date: Thu, 19 Jan 2023 14:34:03 GMT
- Title: Loosely Bound Few-Body States in a Spin-1 Gas with Near-Degenerate
Continua
- Authors: Yaakov Yudkin, Paul S. Julienne, Lev Khaykovich
- Abstract summary: A distinguishing feature of ultracold collisions of bosonic lithium atoms is the presence of two near-degenerate two-body continua.
The influence of such a near-degeneracy on the few-body physics is investigated within the framework of a minimal model.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: A distinguishing feature of ultracold collisions of bosonic lithium atoms is
the presence of two near-degenerate two-body continua. The influence of such a
near-degeneracy on the few-body physics in the vicinity of a narrow Feshbach
resonance is investigated within the framework of a minimal model with two
atomic continua and one closed molecular channel. The model allows analysis of
the spin composition of loosely bound dimers and trimers. In the two-body
sector the well-established coupled-channels calculations phenomenology of
lithium is qualitatively reproduced, and its particularities are emphasized and
clarified. In the three-body sector we find that the Efimov trimer energy
levels follow a different functional form as compared to a single continuum
scenario while the thresholds remain untouched. This three-channel model with
two atomic continua complements our earlier developed three-channel model with
two molecular channels [Y. Yudkin and L. Khaykovich, Phys. Rev. A 103, 063303
(2021)] and suggests that the experimentally observed exotic behavior of the
first excited Efimov energy level [Y. Yudkin, R. Elbaz and L. Khaykovich,
arXiv:2004.02723] is most probably caused by the short-range details of the
interaction potential.
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