| authors: | Vivaldo Campo Jr. Instituto de Fisica de Sao Carlos, University of Sao Paulo, Sao Carlos, Brazil |
The recent experimental realizations of tunable Kondo effect in devices known as single electron transistors has motivated theoretical investigations on non-equilibrium properties. Despite of its success in dealing with systems in equilibrium, letting very accurate calculations of thermodynamical and dynamical properties of quantum impurities, the Numerical Renormalization Group technique has not been largely used to study non-equilibrium properties. In this work we use the Anderson Model to model the SET and present a Numerial Renormalization Group aproach to calculate the non-equilibrium spectral density of the quantum dot, since this function lets one to get the current-voltage curves. We discuss the main difficulties found and some preliminary results.