Andreev reflection off a fluctuating superconductor in the absence of equilibrium

Details Andreev reflection off a fluctuating superconductor in the absence of equilibrium Andreev reflection off a fluctuating superconductor in the absence of equilibrium

2002-02-25

arxiv.org/abs/cond-mat/0202446v2

Physics

Condensed Matter

Superconductivity

13 pages, 6 figures

Scientific paper

10.1103/PhysRevB.66.165413

Andreev reflection between a normal metal and a superconductor whose order parameter exhibits quantum phase fluctuations is examined. The approach chosen is non perturbative in the tunneling Hamiltonian and enables to probe the whole range of voltage biases up to the gap amplitude. Results are illustrated using the one-dimensional Josephson- Junction Array model previously introduced in the linear response regime. Phase fluctuations are shown to affect the differential conductance and are compared to the result of Blonder, Tinkham and Klapwijk for a rigid BCS superconductor. The noise spectrum of the Andreev current is also obtained and its second derivative with respect to frequency is proposed as a direct tool to analyze the phase fluctuations.

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