Nonequilibrium spintronic transport through an artificial Kondo impurity: Conductance, magnetoresistance and shot noise

TL;DR

This paper studies how nonequilibrium spintronic transport in a quantum dot is affected by spin flip processes, Kondo resonance, and ferromagnetic lead orientations, revealing conductance splitting, magnetoresistance changes, and shot noise behavior.

Contribution

It introduces a theoretical analysis of spin flip effects on Kondo resonance and transport properties in quantum dots with ferromagnetic leads, highlighting the impact on conductance and magnetoresistance.

Findings

Differential conductance splits when spin flip amplitude approaches Kondo temperature.

Relative magnetization orientation significantly affects current and shot noise.

Zero-bias tunneling magnetoresistance can become negative with increased spin flip scattering.

Abstract

We investigate the nonequilibrum transport properties of a quantum dot when spin flip processes compete with the formation of a Kondo resonance in the presence of ferromagnetic leads. Based upon the Anderson Hamiltonian in the strongly interacting limit, we predict a splitting of the differential conductance when the spin flip scattering amplitude is of the order of the Kondo temperature. We discuss how the relative orientation of the lead magnetizations strongly influences the electronic current and the shot noise in a nontrivial way. Furthermore, we find that the zero-bias tunneling magnetoresistance becomes negative with increasing spin flip scattering amplitude.