| authors: | Michael Sindel Ludwig-Maximilians-Universität München |
Below the Kondo temperature TK electron transport through a quantum dot (QD) containing an odd number of interacting electrons shows anomalies. A Kondo resonance (KR) in the local density of states, due to the screening of the dot spin by the lead electrons generated by an exchange coupling, is established. For this mechanism both spin species, namely and ¯, are needed. The question what happens to the Kondo effect in QD's coupled to ferromagnetic leads, i.e. leads containing an imbalance between and ¯ -spins, is nontrivial since two types of correlation effects have to be considered. The Kondo resonance will obviously disappear when the leads are completely polarized. It is however of interest what the effect of partially polarized leads on transport properties is and whether the system has a strong coupling fixed point. We focus on the parallel (P) magnetization of the leads. We are computing T=0 properties of a model taking a finite polarization of the leads into account and study it by the NRG method.