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We unravel the coupled dipole dynamics of a two-species Bose-Einsteincondensate with tunable interspecies interaction. We produce a degeneratemixture of $^{41}$K-$^{87}$Rb in an optical trap and we study the dipoleoscillations of both atomic species in the linear response regime. Varying theinterspecies interaction from the weakly to the strongly attractive side, wemeasure the frequencies and the composition of the two dipole eigenmodes. Forenough strong interactions, even beyond the mean-field collapse, we find thatthe frequency of the low-energy eigenmode is determined only by the bare trapfrequencies and the species population imbalance. The experimental results arewell reproduced by numerical simulations based on two coupled Gross-Pitaevskiiequations. Our findings provide a detailed picture of the dipole excitations inasymmetric bosonic mixtures.

Dipole dynamics of an interacting bosonic mixture