Superconducting Proximity Effect and Universal Conductance Fluctuations

Abstract

We examine universal conductance fluctuations (UCFs) in mesoscopic normal-superconducting-normal (N-S-N) structures using a numerical solution of the Bogoliubov - de Gennes equation. We discuss two cases depending on the presence (``open'' structure) or absence (``closed'' structure) of quasiparticle transmission. In contrast to N-S structures, where the onset of superconductivity increases fluctuations, we find that UCFs are suppressed by superconductivity for N-S-N structures. We demonstrate that the fluctuations in ``open'' and ``closed'' structures exhibit distinct responses to an applied magnetic field and to an imposed phase variation of the superconducting order parameter.

(4 pages, 5 figures). Corrected typos in equations, added references, changed Fig. 5 and its discussions. Phys. Rev. B, accepted for publication

References in corpus (6)

• Novel Symmetry Classes in Mesoscopic Normal-Superconducting Hybrid Structures
• Diffusive conductors as Andreev interferometers
• Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface
• Phase-dependent magnetoconductance fluctuations in a chaotic Josephson junction
• Insensitivity to Time-Reversal Symmetry Breaking of Universal Conductance Fluctuations with Andreev Reflection
• Conductance fluctuations in mesoscopic normal-metal/superconductor samples

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• Nonlinear shot noise in mesoscopic diffusive normal-superconducting systems
• Effects of Andreev reflection on the conductance of quantum-chaotic dots
• Anomalous mesoscopic kinetics in disordered superconductors