Excitation spectrum of mesoscopic proximity structures

Pilgram, S. and Belzig, W. and Bruder, C.. (2000) Excitation spectrum of mesoscopic proximity structures. Physical Review B, Vol. 62, H. 18. pp. 12462-12467.

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Official URL: http://edoc.unibas.ch/dok/A6337404

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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 l(N) 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(N) that approaches the behavior predicted by the Usadel equation (diffusive limit). We also discuss the influence 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
UniBasel Contributors:Bruder, Christoph
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Institute of Physics
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Feb 2015 09:59
Deposited On:06 Feb 2015 09:59

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