2008/02/22 by Audrey Cottet, Wolfgang Belzig · 22 citations
Physics and Astronomy · #Biasing #Condensed matter physics #Conductance #Fano factor #Ferromagnetism #Magnetic properties of thin films #Noise (video) #Optics #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Quantum point contact #Quantum well #Scattering #Shot noise #Superconductivity #Voltage #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.064517
published in Physical Review B 77(6) (American Physical Society) · 9 pages, 4 figures
arxiv created 2008/02/22 · openalex publication_date 2008/02/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.