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.

16 pages, 8 figures

References in corpus (5)

• Kondo effect in quantum dots coupled to ferromagnetic leads
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Gate-controlled spin-splitting in quantum dots with ferromagnetic leads in the Kondo regime
• Nonequilibrium Kondo Effect in a Quantum Dot Coupled to Ferromagnetic Leads
• Thermoelectric effects in a strongly interacting quantum dot coupled to ferromagnetic leads

Cited by in corpus (2)

• Compensation effect in carbon nanotube quantum dots coupled to polarized electrodes in the presence of spin-orbit coupling
• Two-orbital Kondo effect in quantum dot coupled to ferromagnetic leads