Outcoupling vector solitons from a Bose-Einstein condensate with time-dependent interatomic forces

We discuss the possibility of emitting vector solitons from a two-component elongated BEC by manipulating in time the inter-or intraspecies scattering lengths with Feshbach resonance tuning. We present different situations which do not have an analog in the single species case. In particular, we show vector soliton outcoupling by tuning the interspecies forces, how the evolution in one species is controlled by tuning the dynamics of the other, and how one can implement the so-called supersolitons. The analysis is performed by numerical simulations of the one-dimensional Gross-Pitaevskii equation. Simple analytic arguments are also presented in order to give a qualitative insight.