| speaker: | Laszlo Borda Budapest, Hungary |
| time: | We., 15.08, 16:00-17:00 |
We study the Kondo model - a magnetic impurity coupled to a one-dimensional wire via exchange coupling - by using Wilson's numerical renormalization-group (NRG) technique. By applying an approach similar to the one used for treating the two-impurity problem we managed to improve the limited 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, and whose existence has been a long-standing problem in solid state physics. We also present results on the temperature dependence of the Kondo correlations.