Two types of phase diagrams for two-species Bose–Einstein condensates and the combined effect of the parameters

Z B Li, Y M Liu, D X Yao, C G Bao
2017 Journal of Physics B: Atomic, Molecular and Optical Physics  
Under the Thomas-Fermi approximation, a relatively much simpler analytical solutions of the coupled Gross-Pitaevskii equations for the two-species BEC have been derived. Additionally, a model for the asymmetric states has been proposed, and the competition between the symmetric and asymmetric states has been evaluated. The whole parameter-space is divided into zones, each supports a specific phase, namely, the symmetric miscible phase, the symmetric immiscible phase, or the asymmetric phase.
more » ... ed on the division the phase-diagrams against any set of parameters can be plotted. Thereby, the effects of these parameters can be visualized. There are three critical values in the inter-species interaction numbers N_A/N_B. They govern the transitions between the phases. Two cases, (i) the repulsive V_AB matches the repulsive (ii) the attractive V_AB nearly cancels the effect of the repulsive V_A+V_B have been particularly taken into account. The former leads to a complete separation of the two kinds of atoms , while the latter lead to a collapse. Finally, based on an equation derived in the paper, a convenient experimental approach is proposed to determine the ratio of particle numbers .
doi:10.1088/1361-6455/aa7440 fatcat:rw2uzkufjfd5panak4tlz5rkka