Abstract
Using scattering matrix method, the spin-dependent conductance and thermopower in ferromagnetic quantum point contacts (QPCs) are calculated at a certain temperature. The results indicate that the exchange splitting energy removes the spin degeneracy and the spin-up and spin-down electrons have different contributions to the conductance and the thermopower. The odd integer multiples of the quantized conductance, G 0 ( = e 2 / h ) , appear and the position of the peaks in thermopower shift correspondingly.
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