Conductance and current noise of a superconductor/ferromagnet quantum point contact
Audrey Cottet, Wolfgang Belzig
DOI 10.1103/PhysRevB.77.064517 · Physical Review B
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Abstract
We study the conductance and current noise of a superconductor/ferromagnet (S/F) single-channel quantum point contact (QPC) as a function of the QPC bias voltage using a scattering approach. We show that the spin dependence of interfacial phase shifts (SDIPS) acquired by electrons upon scattering by the QPC can strongly modify these signals. For a weakly transparent contact, the SDIPS induces subgap resonances in the conductance and differential Fano factor curves of the QPC. For high transparencies, these resonances are smoothed, but the shape of the signals remains extremely sensitive to the SDIPS. We show that noise measurements could help to gain more information on the device, e.g., in cases where the SDIPS modifies qualitatively the differential Fano factor of the QPC, but not the conductance.
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