Resonant Andreev Scattering In Phase-Coherent, Superconducting Nanostructures

Details Resonant Andreev Scattering In Phase-Coherent, Superconducting Nanostructures Resonant Andreev Scattering In Phase-Coherent, Superconducting Nanostructures

1995-10-20

arxiv.org/abs/cond-mat/9510117v1

Physics

Condensed Matter

TeX, 12 pages, 3 figures available on request to m.leadbeater@lancaster.ac.uk (Mark Leadbeater)

Scientific paper

Analytic predictions for resonant transport in three generic structures are presented. For a structure comprising a normal (N) contact - normal dot (NDOT) - superconducting (S) contact, we predict that finite voltage, differential conductance resonances are destroyed by the switching on of superconductivity in the S-contact. In the weak coupling limit, the surviving resonances have a double-peaked line-shape. Secondly, we demonstrate that resonant Andreev interferometers can provide galvonometric magnetic flux detectors, with a sensitivity in excess of the flux quantum. Finally, for a superconducting dot (SDOT) connected to normal contacts (N), we show that the onset of superconductivity can increase the sub-gap conductance, in contrast with the usual behaviour of a tunnel junction.

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