Quantum dot with ferromagnetic leads: a density-matrix renormalization group study

Abstract

A quantum dot coupled to ferromagnetically polarized one-dimensional leads is studied numerically using the density matrix renormalization group method. Several real space properties and the local density of states at the dot are computed. It is shown that this local density of states is suppressed by the parallel polarization of the leads. In this case we are able to estimate the length of the Kondo cloud, and to relate its behavior to that suppression. Another important result of our study is that the tunnel magnetoresistance as a function of the quantum dot on-site energy is minimum and negative at the symmetric point.

4 pages including 5 figures. To be published as a Brief Report in Phys. Rev. B

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
• Spin Dependent Transport in Magnetic Nanostructures

Cited by in corpus (7)

• Nanospintronics with carbon nanotubes
• Kondo effect with non collinear polarized leads: a numerical renormalization group analysis
• Kondo Resonance in the Presence of Spin-Polarized Currents
• Anderson impurity in the one-dimensional Hubbard model on finite size systems
• Study of the charge correlation function in one-dimensional Hubbard heterostructures
• Magnetic and transport properties of the one-dimensional ferromagnetic Kondo lattice model with an impurity
• Magnetic and transport properties of a one dimensional frustrated t-J model for vanadate nanotubes