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Coulomb Effects on Electron Transport and Shot Noise in Hybrid Normal-Superconducting Metallic Structures

A. V. Galaktionov·A. D. Zaikin
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Abstract

We analyze the effect of electron-electron interactions on Andreev current and shot noise in diffusive hybrid structures composed of a normal metal attached to a superconductor via a weakly transmitting interface. We demonstrate that at voltages/temperatures below the Thouless energy of a normal metal Coulomb interaction yields a reduction of both Andreev current and its noise by a constant factor which essentially depends on the system dimensionality. For quasi-1d structures this factor is $\sim N_{\rm Ch}^{8/g}$, where $N_{\rm Ch}$ and $g$ are respectively the number of conducting channels and dimensionless conductance of a normal metal. At voltages above the Thouless energy the interaction correction to Andreev current and shot noise acquires an additional voltage dependence which turns out to be a power-law in the quasi-1d limit.

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A. V. Galaktionov, A. D. Zaikin. 2005-11-18. Coulomb Effects on Electron Transport and Shot Noise in Hybrid Normal-Superconducting Metallic Structures. https://doi.org/10.1103/physrevb.73.184522

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