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The excitation spectrum of mesoscopic proximity structures | | S. Pilgram
; W. Belzig
; C. Bruder
; | | Date: |
14 Jun 2000 | | Journal: | Phys. Rev. B 62, 12462 (2000). | | Subject: | Superconductivity; Mesoscopic Systems and Quantum Hall Effect | cond-mat.supr-con cond-mat.mes-hall | | Affiliation: | University of Basel, TU Delft | | Abstract: | 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 concentration of impurities 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 non-ideal transmittivity of the interface, and the dependence of our results on the choice of the model of impurity scattering. | | Source: | arXiv, cond-mat/0006222 | | Services: | Forum | Review | PDF | Favorites | |
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