Multiparticle tunneling in diffusive superconducting junctions

Authors :: E. V. Bezuglyi
E. N. Bratus
Göran Wendin
Andrey S. Vasenko
Vitaly Shumeiko
Publication Year :: 2007
Publisher :: arXiv, 2007.
Abstract: We formulate a theoretical framework to describe multiparticle current transport in planar superconducting tunnel junctions with diffusive electrodes. The approach is based on direct solving of quasiclassical Keldysh-Green function equations for nonequilibrium superconductors, and consists of a combination of a circuit theory analysis and improved perturbation expansion. The theory predicts much greater scaling parameter for the subharmonic gap structure of the tunnel current in diffusive junctions compared to the one in ballistic junctions and mesoscopic constrictions with the same barrier transparency.<br />Comment: 18 pages, 6 figures, to be published in Supercond. Sci. Techn