Publikation: Excitation spectrum of mesoscopic proximity structures
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We investigate one aspect of the proximity effect, viz., the local density of states of a superconductor-normal metal sandwich. In contrast to earlier work, we allow for the presence of an arbitrary elastic mean free path in the structure. The superconductor induces a gap in the normal-metal spectrum that is proportional to the inverse of the elastic mean free path lN 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 lN that approaches the behavior predicted by the Usadel equation (diffusive limit). We also discuss the nfluence of interface and surface roughness, the consequences of a nonideal transmittivity of the interface, and the dependence of our results on the choice of the model of impurity scattering.
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PILGRAM, Sebastian, Wolfgang BELZIG, Christoph BRUDER, 2000. Excitation spectrum of mesoscopic proximity structures. In: Physical Review B. 2000, 62(18), pp. 12462-12467. Available under: doi: 10.1103/PhysRevB.62.12462BibTex
@article{Pilgram2000Excit-9389, year={2000}, doi={10.1103/PhysRevB.62.12462}, title={Excitation spectrum of mesoscopic proximity structures}, number={18}, volume={62}, journal={Physical Review B}, pages={12462--12467}, author={Pilgram, Sebastian and Belzig, Wolfgang and Bruder, Christoph} }
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