Abstract
We analyze the spin-dependent conductance and spin polarization of a double quantum dot in a T-shape conguration coupled to ferromagnetic leads in the presence of external magnetic eld. The calculations are performed with the aid of the numerical renormalization group method. We show that in the antiparallel con guration, nite magnetic eld can give rise to the full spin polarization of the current, which can be controlled by tuning the dots' levels. On the other hand, for parallel con guration enhanced spin polarization can be generated by an exchange eld due to the presence of ferromagnetic leads and can be also tuned by changing level position or external magnetic eld. The magnetic eld can be thus used to improve the spin-resolved properties of the system.
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