Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-06-16
Phys. Rev. B 80, 205114 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
updated some data, minor changes
Scientific paper
10.1103/PhysRevB.80.205114
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.
Delft Jan von
Heidrich-Meisner Fabian
Holzner Andreas
McCulloch Ian P.
Schollwöck Ulrich
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