Finite frequency noise of a superconductor/ferromagnet quantum point contact
Mesoscale and Nanoscale Physics
2009-02-23 v2 Superconductivity
Abstract
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.
Cite
@article{arxiv.0803.0854,
title = {Finite frequency noise of a superconductor/ferromagnet quantum point contact},
author = {Audrey Cottet and Benoit Doucot and Wolfgang Belzig},
journal= {arXiv preprint arXiv:0803.0854},
year = {2009}
}
Comments
5 pages, 3 figures, revised version, to appear in Phys. Rev. Lett