Compensation of the Kondo effect in quantum dots coupled to ferromagnetic leads within equation of motion approach

Abstract

We propose a new approximation scheme within equation of motion approach (EOM) to spin polarized transport through a quantum dot coupled to ferromagnetic leads. It has some advantages over a widely used in the literature standard EOM technique, in particular when we are interested in spin polarized quantities. Namely, it gives the values of the dot spin polarization which are closer to the ones obtained within numerical renormalization group (NRG), than the standard EOM approach. While restoring the Kondo effect, the spin polarization vanishes and the transport becomes unpolarized, in agreement with NRG and a real time diagrammatic calculations. The standard EOM procedure gives nonzero values of the spin polarization, and the transport is still spin polarized. Both approximations give the same correct splitting of the Kondo peaks due to ferromagnetism in the electrodes.

arXiv comment16 pages, 8 figures

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Cited by in corpus (8)

• Kondo effect in spin-orbit mesoscopic interferometers
• Non-equilibrium spin-current detection with a single Kondo impurity
• Kramers polarization in strongly correlated carbon nanotube quantum dots
• The Functional Integral formulation of the Schrieffer-Wolff transformation
• Influence of assisted hopping interaction on the linear conductance of quantum dot
• Compensation effect in carbon nanotube quantum dots coupled to polarized electrodes in the presence of spin-orbit coupling
• Out-of-equilibrium Kondo Effect in a Quantum Dot: Interplay of Magnetic Field and Spin Accumulation
• Two-orbital Kondo effect in quantum dot coupled to ferromagnetic leads