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Based on Keldysh non-equilibrium Green function method, we have investigatedspin current production in a hybrid T-shaped device, consisting of a centralquantum dot connected to the leads and a side dot which only couples to thecentral dot. The topology of this structure allows for quantum interference ofthe different paths that go across the device, yielding Fano resonances in thespin dependent transport properties. Correlation effects are taken into accountat the central dot and handled within a mean field approximation. Its interplaywith the Fano effect is analyzed in the strong coupling regime. Non-vanishingspin currents are only obtained when the leads are ferromagnetic, the currentbeing strongly dependent on the relative orientation of the lead polarizations.We calculate the conductance (spin and charge) by numerically differentiatingthe current, and a rich structure is obtained as a manifestation of quantumcoherence and correlation effects. Increase of the Coulomb interaction produceslocalization of states at the side dot, largely suppressing Fano resonances.The interaction is also responsible for the negative values of the spinconductance in some regions of the voltage near resonances, effect which is thespin analog of the Esaki tunnel diode. We also analyze control of the currentsvia gate voltages applied to the dots, possibility which is interesting forpractical operations.

A T-shaped double quantum dot system as a Fano interferometer: interplay of coherence and correlation upon spin currents