Dynamical mean-field theory for spin-dependent electron transport in spin-valve devices

We present the combination of Density Functional Theory (DFT) and Dynamical Mean Field (DMFT) for computing electron transmission through two-terminals nanoscale devices. The method is then applied to metallic junctions presenting alternating Cu Co layers, which exhibit spin-dependent charge transport giant magnetoresistance (GMR) effect. calculations show that coherent $3d$ states greatly suppressed by correlations. This mainly due finite lifetime induced electron-electron interaction directly related imaginary part computed many-body DMFT self-energy. At Fermi energy, where in accordance with Fermi-liquid behavior self-energy vanishes, suppression entirely shifts energy spectrum Based our results, we finally suggest GMR measured Cu/Co heterostructures electrons energies about 1 eV above a clear manifestation dynamical correlation effects.