Conductance and current noise of a superconductor/ferromagnet quantum point contact

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 sub-gap 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 remain 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.

9 pages, 4 figures

References in corpus (8)

• Symmetries of Pairing Correlations in Superconductor-Ferromagnet Nanostructures
• Nanospintronics with carbon nanotubes
• Magnetoresistance of a quantum dot with spin-active interfaces
• Spectroscopy and critical temperature of diffusive superconducting/ferromagnetic hybrid structures with spin-active interfaces
• Spin transport across carbon nanotube quantum dots
• Dynamics of spin transport in voltage-biased Josephson junctions
• Exchange effects on electron transport through single-electron spin-valve transistors
• Spin-resolved crossed Andreev reflection in ballistic heterostructures

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• Finite frequency noise of a superconductor/ferromagnet quantum point contact
• Superconducting/ferromagnetic diffusive bilayer with a spin-active interface: a numerical study
• Charge transfer statistics of transport through Majorana bound states
• Kondo effect and spin-active scattering in ferromagnet-superconductor junctions
• Thermodynamic properties of a superconductor interfaced with an altermagnet
• P-wave Cooper pair splitting
• Magnetization near a constriction between BCS superconductors by spin-dependent tunneling