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Density of States below the Thouless Gap in a Mesoscopic SNS Junction | | P. M. Ostrovsky
; M. A. Skvortsov
; M. V. Feigel’man
; | | Date: |
27 Dec 2000 | | Journal: | Phys. Rev. Lett. 87, 027002 (2001) | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Superconductivity | cond-mat.mes-hall cond-mat.supr-con | | Abstract: | Quasiclassical theory predicts an existence of a sharp energy gap E_g sim D/L^2 in the excitation spectrum of a long diffusive superconductor--normal metal--superconductor (SNS) junction. We show that mesoscopic fluctuations remove the sharp edge of the spectrum, leading to a nonzero DoS for all energies. Physically, this effect originates from the quasi-localized states in the normal metal. Technically, we use an extension of Efetov’s supermatrix sigma-model for mixed NS systems. We demonstrate the equivalence of the supersymmetric saddle-point solution to the standard quasiclassical Usadel solution, and show that the instanton solution with broken supersymmetry provides a non-zero DoS at energies E < E_g. | | Source: | arXiv, cond-mat/0012478 | | Services: | Forum | Review | PDF | Favorites | |
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