Kondo effect in quantum dots coupled to ferromagnetic leads with noncollinear magnetizations: effects due to electron-phonon coupling

TL;DR

This paper investigates how electron-phonon interactions affect spin-polarized transport and Kondo phenomena in quantum dots connected to ferromagnetic leads with noncollinear magnetizations, using non-equilibrium Green function methods.

Contribution

It provides a detailed theoretical analysis of electron-phonon coupling effects on transport properties and Kondo peaks in noncollinear ferromagnetic quantum dot systems.

Findings

Electron-phonon coupling modifies tunneling current and conductance.

The Kondo peaks and phonon satellites vary with the magnetic angle.

Tunnel magnetoresistance is influenced by electron-phonon interactions.

Abstract

Spin-polarized transport through a quantum dot strongly coupled to ferromagnetic electrodes with non-collinear magnetic moments is analyzed theoretically in terms of the non-equilibrium Green function formalism. Electrons in the dot are assumed to be coupled to a phonon bath. The influence of electron-phonon coupling on tunnelling current, linear and nonlinear conductance, and on tunnel magnetoresistance is studied in detail. Variation of the main Kondo peaks and phonon satellites with the angle between magnetic moments of the leads is analyzed.