Saturating interaction in coherently coupled two-component Bose-Einstein condensates

R Eid; S Tiengo; M Lévy; T Bourdel

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arXiv · 2507.21849

Saturating interaction in coherently coupled two-component Bose-Einstein condensates

R Eid·S Tiengo·M Lévy·T Bourdel

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Abstract

Rabi-coupled spinor Bose-Einstein condensates, with competing intra-and interspecies interactions, enable independent control of two-and three-body interactions. We show that coupling can also drive the system into a strongly nonlinear regime of saturating interaction. More precisely, the equation of state interpolates between low-and high-density regimes described by two different two-body scattering lengths. Interestingly, the transition can be determined by the strength of the coupling. We experimentally demonstrate this saturation phenomenon by measurements of the interaction energy of a Bose-Einstein condensate as a function of the detuning and of the strength of the Rabi coupling in spin mixtures of potassium 39.

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R Eid, S Tiengo, M Lévy, T Bourdel. 2025-07-29. Saturating interaction in coherently coupled two-component Bose-Einstein condensates. https://arxiv.org/abs/2507.21849

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