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In this work, it is considered a nanostructure composed by a quantum dotcoupled to two ferromagnets and a superconductor. The transport properties ofthis system are studied within a generalized mean-field approximation takinginto account proximity effects and spin-flip correlations within the quantumdot. It is shown that the zero-bias transmittance for the co-tunneling betweenthe ferromagnetic leads presents a dip whose height depends on the relativeorientation of the magnetizations. When the superconductor is coupled to thesystem, electron-hole correlations between different spin states leads to aresonance in the place of the dip appearing in the transmittance. Such aneffect is accompanied by two anti-resonances explained by a leakage ofconduction channels from the co-tunneling to the Andreev transport. In thenon-equilibrium regime, correlations within the quantum dot introduce adependence of the resonance condition on the finite bias applied to theferromagnetic leads. However, it is still possible to observe signatures of thesame interference effect in the electrical current.

Interference effects induced by Andreev bound states in a hybrid  nanostructure composed by a quantum dot coupled to ferromagnetic and  superconductor leads