Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena
TT 6.43: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Kondo screening cloud in the Anderson impurity model — •Andreas Holzner1,2, Fabian Heidrich-Meisner1, Ian McCulloch3, Ulrich Schollwöck1, and Jan von Delft2 — 1Institut für Theoretische Physik C, RWTH Aachen University, D-52056 Aachen, Germany — 2Lehrstuhl für Theoretische Festkörperphysik, Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience, Ludwig-Maximilians-Universität München, Theresienstraße 37, D-80333 München, Germany — 3School of Physical Sciences, University of Queensland, QLD 4072, Australia
A magnetic moment in a metal or in a quantum dot is, at low temperatures, screened by the conduction electrons by 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. Our goal is to elucidate whether the Kondo screening length, typically assumed to be proportional to the inverse Kondo temperature, can be extracted from the spin correlations. For several mechanisms that destroy the Kondo effect, we investigate the induced behavior of the screening cloud.