Issue
EPL
Volume 83, Number 5, September 2008
Article Number 57003
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/83/57003
Published online 19 August 2008
EPL, 83 (2008) 57003
DOI: 10.1209/0295-5075/83/57003

Transport properties of an interacting quantum dot with a non-uniform magnetization

N. Sedlmayr and J. Berakdar

Institut für Physik, Martin-Luther Universität Halle-Wittenberg - Heinrich-Damerow-Str.4, 06120 Halle (Saale), Germany, EU

nicholas.sedlmayr@physik.uni-halle.de

received 7 April 2008; accepted in final form 8 July 2008; published September 2008
published online 19 August 2008

Abstract
We study the influence of the non-homogeneity of a magnetization field on the behaviour of interacting electrons in a quantum dot. In particular we investigate the magnetotransport properties when the dot is weakly coupled to two ferromagnetic leads. We take into account the interactions in the quantum dot non-perturbatively. For a magnetization which varies slowly on the scale of the Fermi wavelength, the non-homogeneity effect is described by a gauge potential that can be treated perturbatively.

PACS
72.25.Mk - Spin transport through interfaces.
73.63.Kv - Quantum dots.
85.75.-d - Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields.

© EPLA 2008