Kondo screening cloud in the single-impurity Anderson model: A density matrix renormalization group study
Abstract
A magnetic moment in a metal or in a quantum dot is, at low temperatures, screened by the conduction electrons through the mechanism of the Kondo effect. This gives rise to spin-spin correlations between the magnetic moment and the conduction electrons, which can have a substantial spatial extension. We study this phenomenon, the so-called Kondo cloud, by means of the density matrix renormalization group method for the case of the single-impurity Anderson model. We focus on the question whether the Kondo screening length, typically assumed to be proportional to the inverse Kondo temperature, can be extracted from the spin-spin correlations. For several mechanisms -- the gate potential and a magnetic field -- which destroy the Kondo effect, we investigate the behavior of the screening cloud induced by these perturbations.
Cite
@article{arxiv.0906.2933,
title = {Kondo screening cloud in the single-impurity Anderson model: A density matrix renormalization group study},
author = {Andreas Holzner and Ian P. McCulloch and Ulrich Schollwöck and Jan von Delft and Fabian Heidrich-Meisner},
journal= {arXiv preprint arXiv:0906.2933},
year = {2009}
}
Comments
updated some data, minor changes