Diffusive and ballistic motion in superconducting hybrid structures

Details Diffusive and ballistic motion in superconducting hybrid structures Diffusive and ballistic motion in superconducting hybrid structures

1995-09-25

arxiv.org/abs/cond-mat/9509148v1

Physics

Condensed Matter

LaTex file, 9 pages, 12 figures (Ps files available on request)

Scientific paper

10.1103/PhysRevB.53.9310

We examine transport properties of superconducting hybrid mesoscopic structures, in both the diffusive and ballistic regimes. For diffusive structures, analytic results from quasi-classical theory are compared with predictions from numerical, multiple-scattering calculations performed on small structures. For all structures, the two methods yield comparable results and in some cases, quantitative agreement is obtained. These results not only demonstrate that quasi-classical theory can yield the ensemble averaged conductance $$ of small structures of dimensions of order 10- 20 Fermi wavelengths, but also establish that numerical scattering calculations on such small structures can yield results for $$ which are characteristic of much larger systems. Having compared the two approaches, we extend the multiple-scattering analysis to the ballistic limit, where the sample dimensions become smaller than the elastic mean free path and demonstrate that the properties of certain Andreev interferometers are unchanged in the clean limit.

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