Kondo Resonance in the Presence of Spin-Polarized Currents

TL;DR

This paper introduces an improved equation of motion method to analyze the Kondo effect under spin-polarized non-equilibrium conditions, simplifying previous approaches and effectively addressing spin-split Kondo peaks caused by spin currents.

Contribution

An improved equation of motion approach that eliminates the need for extra renormalization in non-equilibrium Kondo studies, enabling more accurate analysis of spin-polarized effects.

Findings

No additional renormalization needed with proper decoupling scheme

Effective analysis of spin-split Kondo peaks due to spin currents

Simplified method for non-equilibrium Kondo problems

Abstract

We propose an improved method of the equation of motion approach to study the Kondo problem in spin-dependent non-equilibrium conditions. We find that the previously introduced additional renormalization for non-equilibrium Kondo effects is not required when we use a proper decoupling scheme. Our improved formulation is then applied to address the spin-split Kondo peaks when a spin current injects into a Kondo system.