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arXiv 0704.3729cond-mat.mes-hall
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扩散超导体-正常金属-超导体结中电流噪声的低偏压发散和下混频

Divergence at low bias and down-mixing of the current noise in a diffusive superconductor-normal metal-superconductor junction

Elsa Lhotel, Olivier Coupiac, François Lefloch, Hervé Courtois, Marc Sanquer

摘要:

我们目前的电流噪声测量在一个长的扩散超导正常金属超导结在低电压制度,其中运输可以部分地描述在相干多Andreev反射。我们发现,当电压降低时,电流噪声表现出强烈的发散性以及一个宽峰。我们把这个峰归因于交流约瑟夫森电流和结本身噪声之间的混合。我们表明,结噪声对应于一个非线性电阻4kBT=R,R V = I V和没有可调参数的热噪声。

英文摘要:

We present current noise measurements in a long diffusive superconductor-normal-metal-superconductor junction in the low voltage regime, in which transport can be partially described in terms of coherent multiple Andreev reflections. We show that, when decreasing voltage, the current noise exhibits a strong divergence together with a broad peak. We ascribe this peak to the mixing between the ac- Josephson current and the noise of the junction itself. We show that the junction noise corresponds to the thermal noise of a nonlinear resistor 4kBT=R with R V = I V and no adjustable parameters.

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