Andreev reflection off a fluctuating superconductor in the absence of equilibrium

Abstract

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.

arXiv comment13 pages, 6 figures

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Cited by in corpus (4)

• Suppression of low-energy Andreev states by a supercurrent in YBa_2Cu_3O_7-delta
• Dominant Andreev Reflection through Nonlinear Radio-Frequency Transport
• Photo-assisted Andreev reflection as a probe of quantum noise
• Josephson junction chains with long-range interactions: Phase slip proliferation versus Kosterlitz-Thouless transition