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Enhanced current shot noise in superconducting junctions

机译:超导结中增强的电流散粒噪声

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摘要

We present theory for a current shot noise in mesoscopic diffusive superconductor-normal metal-superconductor (SNS) junctions. The current shot noise is tremendously enhanced at small applied voltage, V < Δ/c, due to the mechanism of multiple Andreev reflection (MAR), which creates long correlated trains of transmitted electrons. The central result for the MAR regime is a universal value for the noise power in the limit of small voltage and at zero physical temperature, which corresponds to the effective noise temperature of the order of superconducting energy gap Δ. At very small voltage, MAR is destroyed by inelastic relaxation, consequently, the level of noise reduces and approaches at V = 0 the thermal noise value. We investigate the suppression of MAR by inelastic scattering processes and analyze the crossover from the MAR regime to a hot electron regime.
机译:我们提出了介观扩散超导体-法向金属-超导体(SNS)结中电流散粒噪声的理论。由于多重安德列夫反射(MAR)的机制,电流散粒噪声在较小的施加电压V <Δ/ c时得到了极大的增强,这会产生长相关的传输电子序列。 MAR机制的主要结果是噪声功率在小电压极限和零物理温度下的通用值,它对应于超导能隙Δ量级的有效噪声温度。在非常小的电压下,MAR被非弹性松弛破坏,因此,噪声水平降低,并在V = 0时接近热噪声值。我们研究了非弹性散射过程对MAR的抑制作用,并分析了从MAR体系到热电子体系的交叉。

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