Superconducting Proximity Effect and Universal Conductance Fluctuations
Abstract
We examine universal conductance fluctuations (UCFs) in mesoscopic normal-superconducting-normal (N-S-N) structures using a numerical solution of the Bogoliubov - de Gennes equation. We discuss two cases depending on the presence (``open'' structure) or absence (``closed'' structure) of quasiparticle transmission. In contrast to N-S structures, where the onset of superconductivity increases fluctuations, we find that UCFs are suppressed by superconductivity for N-S-N structures. We demonstrate that the fluctuations in ``open'' and ``closed'' structures exhibit distinct responses to an applied magnetic field and to an imposed phase variation of the superconducting order parameter.
Cite
@article{arxiv.cond-mat/9904016,
title = {Superconducting Proximity Effect and Universal Conductance Fluctuations},
author = {Tero T. Heikkila and Martti M. Salomaa and C. J. Lambert},
journal= {arXiv preprint arXiv:cond-mat/9904016},
year = {2009}
}
Comments
(4 pages, 5 figures). Corrected typos in equations, added references, changed Fig. 5 and its discussions. Phys. Rev. B, accepted for publication