Spectral Features of the Proximity Effect

Details Spectral Features of the Proximity Effect Spectral Features of the Proximity Effect

1999-07-30

arxiv.org/abs/cond-mat/9907483v1

Physics

Condensed Matter

Superconductivity

LT22 proceedings

Scientific paper

10.1016/S0921-4526(99)01827-X

We calculate the local density of states (LDOS) of a superconductor-normal metal sandwich at arbitrary impurity concentration. The presence of the superconductor induces a gap in the normal metal spectrum that is proportional to the inverse of the elastic mean free path $l$ for rather clean systems. For a mean free path much shorter than the thickness of the normal metal, we find a gap size proportional to $l$ that approaches the behavior predicted by the Usadel equation (diffusive limit).

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