Saturating interaction in coherently coupled two-component Bose-Einstein condensates
Quantum Gases
2025-07-30 v1 Quantum Physics
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.
Cite
@article{arxiv.2507.21849,
title = {Saturating interaction in coherently coupled two-component Bose-Einstein condensates},
author = {R Eid and S Tiengo and M Lévy and T Bourdel},
journal= {arXiv preprint arXiv:2507.21849},
year = {2025}
}