Abstract
Spin-dependent electronic transport through a quantum dot side-coupled to two quantumdots and attached to ferromagnetic leads with collinear (parallel and antiparallel)magnetizations is analyzed theoretically. The intra-dot Coulomb correlations are takeninto account, whereas the inter-dot ones are neglected. Transport characteristics,i.e. conductance and tunnel magnetoresistance associated with the magnetization rotationfrom parallel to antiparallel configurations, are calculated by the non-equilibriumGreen’s function technique. The Green’s functions are derived by the equation ofmotion method in the Hartree–Fock approximation. The conductance spectraare shown to reveal features similar to the Dicke resonance in atomic physics.
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