Finite frequency noise of a superconductor/ferromagnet quantum point contact

Details Finite frequency noise of a superconductor/ferromagnet quantum point contact Finite frequency noise of a superconductor/ferromagnet quantum point contact

2008-03-06

arxiv.org/abs/0803.0854v2

Phys. Rev. Lett. 101, 257001 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, revised version, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.257001

We have calculated the finite-frequency current noise of a superconductor-ferromagnet quantum point contact (SF QPC). This signal is qualitatively affected by the spin-dependence of interfacial phase shifts (SDIPS) acquired by electrons upon reflection on the QPC. For a weakly transparent QPC, noise steps appear at frequencies or voltages determined directly by the SDIPS. These steps can occur at experimentally accessible temperatures and frequencies. Finite frequency noise is thus a promising tool to characterize the scattering properties of a SF QPC.

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