Abstract
We have studied the thermoelectric properties through ferromagnetic leads-QD coupled system (F-QD-F) in the Kondo regime by nonequilibrium Green's functions method. The spin-flip effect induced by ferromagnetic leads and Kondo effect influence the thermoelectric properties significantly. The peak-valley structure emerges at the low temperature due to Kondo resonance, and the peak-valley structure also relies on the polarization angle θ, the spin-dependent linewidth function Γγσ and the energy level of QD ∈d. Novel resonant peak also emerges in the curve of ZTc versus polarization angle θ. The Kondo effect suppresses the figure of merit ZTc and the spin-dependent figure of merit ZTs. In addition, the spin-dependent figure of merit ZTs is relate with the gap between Γγ↑ and Γγ↓.
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