Spin-polarized transport through two coupled quantum dots

Spin-dependent transport through two coupled single-level quantum dots attached to ferromagnetic leads with collinear (parallel and antiparallel) magnetizations is analyzed theoretically. Generally, the intra- and inter-dot Coulomb correlations are taken into account. Transport characteristics, including conductance and tunnel magnetoresistance associated with the magnetization rotation from the parallel to antiparallel configurations, are calculated by the noneqiulibrium Green function technique. The relevant Green functions are derived by the equation of motion method. To close the set of equations we employ the Hartree-Fock decoupling scheme. The dot occupation numbers and the Green functions are calculated self-consistently. We focus on the interplay of interference (Fano resonance) and Coulomb interaction effects.