Abstract
We analyze the charge transport in a ferromagnet/quantum dot/superconductor system assuming an exchange-type interaction on the quantum dot. The nonequilibrium Green’s function method is employed to calculate the tunneling charge conductance. When the ferromagnetic lead is in the half-metallic limit, the key mechanism governing the low-energy charge transport of this hybrid structure is the so-called same-spin-band Andreev reflection, in which the incident electron and the Andreev reflected hole belong to the same spin-band. The same-spin-band Andreev reflection depends sensitively on the relative angle θ between the exchange field in ferromagnetic lead and the exchange field in quantum dot, and may induce giant magnetoresistance effect in the low temperature regime.
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