Josephson Frequency Singularity in the Noise of Normal Metal-Superconductor Junctions

Details Josephson Frequency Singularity in the Noise of Normal Metal-Superconductor Junctions Josephson Frequency Singularity in the Noise of Normal Metal-Superconductor Junctions

1999-02-19

arxiv.org/abs/cond-mat/9902278v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, revised version

Scientific paper

10.1103/PhysRevB.60.11935

A singularity at the Josephson frequency in the noise spectral density of a disordered normal metal -- superconductor junction is predicted for bias voltages below the superconducting gap. The non-stationary Aharonov-Bohm effect, recently introduced for normal metals, is proposed as a tool for detecting this singularity. In the presence of a harmonic external field, the derivative of the noise with respect to the voltage bias reveals jumps when the applied frequency is commensurate with the Josephson frequency associated with this bias. The height of these jumps is non-monotonic in the amplitude of the periodic field. The superconducting flux quantum enters this dependence. Additional singularities in the frequency dependent noise are predicted above gap.

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