Subgap noise of a superconductor-normal-metal tunnel interface

Abstract

It is well established that the subgap conductivity through a normal-metal-insulator-superconductor (NIS) tunnel junction is strongly affected by interference of electron waves scattered by impurities. In this paper we investigate how the same phenomenon affects the low frequency current noise, $S$, for voltages $V$ and temperatures $T$ much smaller than the superconducting gap. If the normal metal is at equilibrium we find that the simple relation $S(V,T)=4e\coth (eV/T)I(V,T)$ holds quite generally even for non-linear $I$-$V$ characteristics. Only when the normal metal is out of equilibrium, noise and current become independent. Their ratio, the Fano factor, depends then on the details of the layout.

8 pages, 4 figures. To be published in Physical Review B

References in corpus (8)

• Full Counting Statistics of a Superconducting Beam Splitter
• Chaotic dot-superconductor analog of the Hanbury Brown Twiss effect
• Doubled Full Shot Noise in Quantum Coherent Superconductor - Semiconductor Junctions
• Circuit Theory for Full Counting Statistics in Multi-Terminal Circuits
• Phase Sensitive Shot Noise in an Andreev Interferometer
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• Nonlinear shot noise in mesoscopic diffusive normal-superconducting systems
• Energy dependence of current noise in superconducting/normal metal junctions

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• DC-transport in superconducting point contacts: a full counting statistics view
• Fluctuation dissipation relations for strongly correlated out-of-equilibrium circuits
• Coulomb Effects on Electron Transport and Shot Noise in Hybrid Normal-Superconducting Metallic Structures
• Full counting statistics of Andreev scattering in an asymmetric chaotic cavity
• Full Counting Statistics of Generic Spin Entangler with Quantum Dot-Ferromagnet detectors
• AC driven strongly correlated quantum circuits and Hall edge states: Unified photo-assisted noise and revisited minimal excitations
• Energy dependence of current noise in double-barrier normal-superconducting structures
• Mesoscopic electron transport and atomic gases, a review of Frank W. J. Hekking's scientific work