Kondo effect in quantum dots coupled to ferromagnetic leads with noncollinear magnetizations

Non-equilibrium Green's function technique has been used to calculate spin-dependent electronic transport through a quantum dot in the Kondo regime. The dot is described by the Anderson Hamiltonian and is coupled symmetrically to two ferromagnetic leads, whose magnetic moments are noncollinear. It is shown that the splitting of the zero bias Kondo anomaly in differential conductance decreases monotonously with increasing angle between magnetizations, and vanishes in the limit of antiparallel configuration