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arXiv 0912.0123cond-mat.mes-hallcond-mat.supr-con
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正常金属/超导体混合结构中的非局域输运:干扰和相互作用的作用

Non-local transport in normal-metal/superconductor hybrid structures: the role of interference and interaction

J. Brauer, F. Hübler, M. Smetanin, D. Beckmann, H. v. Löhneysen

摘要:

我们测量了由电子束光刻和阴影蒸发制备的介观正常金属/超导体混合结构的局部和非局部电导。样品的几何形状由超导铝棒与两个正常的金属线形成隧道接触的铝在超导相干长度的顺序的距离。我们观察到子间隙异常的本地和非本地电导,迅速衰减与磁场和温度。对于非本地电导的正负符号被发现作为偏置条件的函数,在交叉Andreev反射和弹性cotunneling的竞争指示。我们的数据表明,信号是由相位相干增强的运输,而不是动态的库仑阻塞。

英文摘要:

We have measured local and non-local conductance of mesoscopic normal-metal/superconductor hybrid structures fabricated by e-beam lithography and shadow evaporation. The sample geometry consists of a superconducting aluminum bar with two normal-metal wires forming tunnel contacts to the aluminum at distances of the order of the superconducting coherence length. We observe subgap anomalies in both local and non-local conductance that quickly decay with magnetic field and temperature. For the non-local conductance both positive and negative signs are found as a function of bias conditions, indicating at a competition of crossed Andreev reflection and elastic cotunneling. Our data suggest that the signals are caused by a phase-coherent enhancement of transport rather than dynamical Coulomb blockade.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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