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首页> 外文期刊>Physical review >Closing the proximity gap in a metallic Josephson junction between three superconductors
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Closing the proximity gap in a metallic Josephson junction between three superconductors

机译：封闭三个超导体之间的金属约瑟夫森结中的接近间隙

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摘要

We describe the proximity effect in a short disordered metallic junction between three superconducting leads. Andreev bound states in the multiterminal junction may cross the Fermi level. We reveal that for a quasicontinuous metallic density of states, crossings at the Fermi level manifest as a closing of the proximity-induced gap. We calculate the local density of states for a wide range of transport parameters using quantum circuit theory. The gap closes inside an area of the space spanned by the superconducting phase differences. We derive an approximate analytic expression for the boundary of the area and compare it to the full numerical solution. The size of the area increases with the transparency of the junction and is sensitive to asymmetry. The finite density of states at zero energy is unaffected by the electron-hole decoherence present in the junction, although decoherence is important at higher energies. Our predictions can be tested using tunneling transport spectroscopy. To encourage experiments, we calculate the current-voltage characteristic in a typical measurement setup. We show how the structure of the local density of states can be mapped out from the measurement.
机译：我们描述了三个超导引线之间的短无序金属结中的邻近效应。多端结中的安德列夫结合态可能会越过费米能级。我们揭示出对于准连续的金属密度状态，费米能级的交叉表现为邻近感应间隙的闭合。我们使用量子电路理论计算各种传输参数的状态局部密度。间隙在由超导相位差跨越的空间区域内闭合。我们导出该区域边界的近似解析表达式，并将其与完整的数值解进行比较。区域的大小随结的透明度而增加，并且对不对称敏感。零能量状态的有限密度不受结中电子空穴退相干的影响，尽管退相干在较高能量下很重要。我们的预测可以使用隧道传输光谱法进行检验。为了鼓励实验，我们在典型的测量设置中计算电流-电压特性。我们展示了如何从测量结果中映射出局部状态密度的结构。

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  • 来源
    《Physical review》 |2015年第20期|205409.1-205409.6|共6页
  • 作者

    C. Padurariu; T. Jonckheere; J. Rech; R. Melin; D. Feinberg; T. Martin; Yu. V. Nazarov;

  • 作者单位

    Universite Grenoble Alpes, Institut NEEL, F-38000 Grenoble, France,CNRS, Institut NEEL, F-38000 Grenoble, France;

    Aix-Marseille Universite, Universite de Toulon, CNRS, CPT, UMR 7332, 13288 Marseille, France;

    Aix-Marseille Universite, Universite de Toulon, CNRS, CPT, UMR 7332, 13288 Marseille, France;

    Universite Grenoble Alpes, Institut NEEL, F-38000 Grenoble, France,CNRS, Institut NEEL, F-38000 Grenoble, France;

    Universite Grenoble Alpes, Institut NEEL, F-38000 Grenoble, France,CNRS, Institut NEEL, F-38000 Grenoble, France;

    Aix-Marseille Universite, Universite de Toulon, CNRS, CPT, UMR 7332, 13288 Marseille, France;

    Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands;

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  • 正文语种 eng
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  • 关键词

    proximity effects; Andreev effect; SN and SNS junctions; superconducting devices; josephson devices;

    机译：邻近效应;安德列夫效应;SN和SNS交界处;超导装置;约瑟夫森设备;

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