Bosonic binary mixtures with Josephson-type interactions

Motivated by experiments in bosonic mixtures composed of a single element in two different hyperfine states, we study bosonic binary mixtures in the presence of Josephson interactions between species. We focus on a particular model with $O(2)$ isospin symmetry, lifted by an imbalanced population parametrized by a Rabi frequency, $Ω_{R}$, and a detuning, $ν$, which couples the phases of both species. We have studied the model at mean-field approximation plus Gaussian fluctuations. We have found that both species simultaneously condensate below a critical temperature $T_{c}$ and the relative phases are locked by the applied laser phase, $α$. Moreover, the condensate fractions are strongly dependent on the ratio $Ω_{R}/|ν|$ that is not affected by thermal fluctuations.

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