In this paper we study the charge and spin currents transported by the elementary excitations of the one-dimensional Hubbard model. The corresponding current spectra are obtained by both analytic methods and numerical solution of the Bethe-ansatz equations. For the case of half-filling, we find that the spin-triplet excitations carry spin but no charge, while charge
η-spin triplet excitations carry charge but no spin, and both spin-singlet and charge
η-spin-singlet excitations carry neither spin nor charge currents.
The problem of spin-charge separation is addressed by considering current carrying states in a one-dimensional system of interacting electrons. Exact results for the Hubbard model and the bosonization method are exploited. We find that away from half filling both spin and charge excitations carry charge currents which are proportional to their momenta for most cases. Being in a qualitative agreement with the noninteracting ld Fermi gas picture, this result contradicts the spin-charge separation concept as it is usually derived e.g. from the bosonization approach or in a strong repulsion picture. For weak coupling the paradox is resolved by taking into account the Fermi velocity dispersion and by reexamining the structure of the current operator within the bosonization approach. For strong coupling we recover an effect of hale drag by a spinon as reflected in their momentum shifts.