Dicke-like effect in spin-polarized transport through coupled quantum dots

TL;DR

This paper theoretically investigates spin-dependent transport in a system of coupled quantum dots with ferromagnetic leads, revealing Dicke-like resonance features in conductance spectra due to quantum interference effects.

Contribution

It introduces a model for spin-polarized transport in coupled quantum dots considering intra-dot Coulomb interactions and demonstrates Dicke-like resonances in conductance spectra.

Findings

Dicke-like resonance features appear in conductance spectra.

Transport characteristics depend on magnetization configuration.

Theoretical analysis uses nonequilibrium Green function technique.

Abstract

Spin-dependent electronic transport through a quantum dot side-coupled to two quantum dots and attached to ferromagnetic leads with collinear (parallel and antiparallel) magnetizations is analyzed theoretically. The intra-dot Coulomb correlations are taken into account, whereas the inter-dot ones are neglected. Transport characteristics, i.e. conductance and tunnel magnetoresistance associated with the magnetization rotation from parallel to antiparallel configurations, are calculated by the noneqiulibrium Green function technique. The Green functions are derived by the equation of motion method in the Hartree-Fock approximation. The conductance spectra are shown to reveal features similar to the Dicke resonance in atomic physics.