Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 37.9: Talk

Friday, February 29, 2008, 12:30–12:45, H 2053

Kondo screening cloud in a one-dimensional wire: Numerical renormalization group study — •László Borda — Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Germany — Department of Theoretical Physics, TU Budapest, H1111 Budapest, Budafoki út 8. Hungary

We study the Kondo model -a magnetic impurity coupled to a one-dimensional wire via exchange coupling- by using Wilson's numerical renormalization group technique. By applying an approach similar to which was used to compute the two-impurity problem we managed to improve the poor spatial resolution of the numerical renormalization group method. In this way we have calculated the impurity-spin-conduction-electron-spin correlation function which is a measure of the Kondo compensation cloud whose existence has been a long-standing problem in solid-state physics. We also present results on the temperature dependence of the Kondo correlations.