Three-body spin mixing in spin-1 Bose-Einstein condensates

Mestrom, P. M. A.; Li, J.-L.; Colussi, V. E.; Secker, T.; Kokkelmans, Sjjmf Servaas

doi:10.1103/physreva.104.023321

“…1). In contrast to other studies of few-body physics in a spinor gas [40,41], we work at large magnetic fields (µ B B A hf ) and with a single, well-defined, entrance spin channel (the bb-channel). The model is designed to capture resonant scattering and associated loosely bound states.…”

Section: Model Descriptionmentioning

confidence: 99%

Loosely Bound Few-Body States in a Spin-1 Gas with Near-Degenerate Continua

Yudkin¹,

Julienne²,

Khaykovich³

2023

Preprint

0

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A distinguishing feature of ultracold collisions of bosonic lithium atoms is the presence of two neardegenerate 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 wellestablished 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 [1] and suggests that the experimentally observed exotic behavior of the first excited Efimov energy level [2] is most probably caused by the short-range details of the interaction potential.

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“…1). In contrast to other studies of few-body physics in a spinor gas [41,42], we work at large magnetic fields (µ B B A hf ) and with a single, well-defined, entrance spin channel (the bb-channel). The model is designed to capture resonant scattering and associated loosely bound states.…”

Section: Model Descriptionmentioning

confidence: 99%

Loosely bound few-body states in a spin-1 gas with near-degenerate continua

Yudkin

¹

,

Julienne

²

,

Khaykovich

³

2023

Phys. Rev. A

4

0

View full text Add to dashboard Cite

A distinguishing feature of ultracold collisions of bosonic lithium atoms is the presence of two neardegenerate 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 wellestablished 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 [1] and suggests that the experimentally observed exotic behavior of the first excited Efimov energy level [2] is most probably caused by the short-range details of the interaction potential.

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“…* shinatan@pku.edu.cn For three-body collisions, there are also big differences due to different spatial dimensions or different quantum statistics of the particles. The scattering hypervolume was defined for identical bosons [24], distinguishable particles [25][26][27], and spin-polarized fermions [28] in three dimensions. The scattering hypervolume is a threebody analog of the two-body s-wave or p-wave scattering length.…”

Section: Introductionmentioning

confidence: 99%