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We deal with the electric current ∞owing through a short chain of paramagnetic ionic blocks, coupled to metal- lic electrodes in the serial conflguration. An original three-band Hubbard{Anderson Hamiltonian is diagonalised at the level of the single ionic block. A minimal but su-cient set of the latter's four hybridised eigenstates serves as a basis for the determination of the time-ordered temperature-dependent matrix Green functions, in terms of which all the current{voltage (I{V ) characteristics can be expressed provided the coupling to the electrodes is weak. The separation of the opposite-spin contributions to the electric current and, consequently, the spin current from the left to right electrode can result from the on-site Coulomb repulsion term of Hubbard{Anderson Hamiltonian, with no spin polarisation at the electrodes, but with the Zeeman-like coupling of the centre to either a molecular or an external magnetic fleld.

Spin and Charge Current in a Short Semiconducting Chain of Paramagnetic Ionic Blocks