Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.38: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
Simulation of long range Kondo signatures in the local density of states for buried magnetic impurities — •Piet Eric Dargel1, Robert Peters1, Thomas Pruschke1, Henning Prüser2, Martin Wenderoth2, Alexander Weismann2, and Rainer G. Ulbrich2 — 1Institut für Theoretische Physik, Georg-August Universität Göttingen, Germany — 2IV. Physikalisches Institut, Georg-August Universität Göttingen, Germany
Recent scanning tunneling spectroscopy (STS) studies of buried magnetic impurities in copper have shown strong signatures in the local density of states (LDOS) at the surface of the system above the impurities. We identify these signatures as long range fingerprints of the Kondo effect and choose the Single Impurity Anderson Model (SIAM) to model the system. Using an equation of motion (EOM) technique for the evaluation of the Green's function (GF) at the surface, we need to calculate the GF on the impurity with hybridization functions that depend on the free GF of the copper crystal at the impurity position. A linear combination of atomic orbitals (LCAO) approach is used for the free GF of the copper crystal and for the evaluation of the GF of the impurity we apply the Numerical Renormalization Group (NRG). The resulting LDOS at the surface shows a qualitatively very good agreement with the experimental data.