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

• URL: http://arxiv.org/abs/2507.21849v1
• Date: Tue, 29 Jul 2025 14:24:10 GMT
• Title: Saturating interaction in coherently coupled two-component Bose-Einstein condensates
• Authors: R Eid, S Tiengo, M Lévy, T Bourdel,
• Abstract summary: We show that coupling can drive the system into a strongly nonlinear regime of saturating interaction.<n>We experimentally demonstrate this saturation phenomenon by measurements of the interaction energy of a Bose-Einstein condensate.
• Score: 0.5416466085090772
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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