Nonlinear Josephson-type oscillations of a driven, two-component Bose-Einstein condensate

We propose an experiment that would demonstrate nonlinear Josephson-type os cillations in the relative population of a driven, two-component Bose-Einst ein condensate. An initial state is prepared in which two condensates exist in a magnetic trap, each in a different hyperfine state, where the initial populations and relative phase between condensates can be controlled withi n experimental uncertainty. A weak driving field is then applied, which cou ples the two internal states of the atom and consequently transfers atoms b ack and forth between condensates. We present a model of this system and in vestigate the effect of the mean field on the dynamical evolution. [S1050-2 947(99)50801-9].