Spin-Polarized Transport Properties Through Double Quantum Dots

We study spin-polarized transport phenomena through double quantum dots coupled to ferromagnetic leads. By using the slave-boson mean-field approximation, we calculate the conductance in the Kondo regime for different setups: we change the configuration of the dots continuously from "series" to "parallel". We find that transport properties, which are sensitive to the arrangement of the dots, exhibit characteristic dependence on the polarization of two ferromagnetic leads. These properties are explained in terms of the Kondo resonances appearing in the local density of states and the transmission probability through the system.