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Linear ac response of diffusive SNS junctions

机译:扩散SNS结的线性交流响应

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摘要

We explore the behavior of the ac admittance of superconductor-normal-metal-superconductor (SNS) junctions as the phase difference of the order parameters between the superconductors is varied. We find three characteristic regimes, defined by comparison of the driving frequency ω to the inelastic scattering rate Γ and the Thouless energy E_T of the junction (typically hΓ « E_T). Only in the first regime ω « Γ does the usual picture of the kinetic inductance hold. We show that the ac admittance can be used to directly access some of the characteristic quantities of the SNS junctions, in particular the phase-dependent energy minigap and the typically phase-dependent inelastic scattering rate. Our results partially explain the recent measurements of the linear response properties of SNS superconducting quantum interference devices (SQUIDs) and predict a number of new effects.
机译:我们探索了超导体-正常金属-超导体(SNS)结的交流导纳的行为,因为超导体之间的阶跃参数的相差有所变化。我们发现了三种特征状态,它们是通过将驱动频率ω与非弹性散射率Γ和结的无声能量E_T(通常为hΓ«E_T)进行比较来定义的。只有在第一状态ω«Γ中,才能保持惯性矩的通常情况。我们表明,交流导纳可用于直接访问SNS结的某些特征量,特别是相位相关的能量最小能隙和典型的相位相关的非弹性散射率。我们的结果部分解释了SNS超导量子干扰设备(SQUID)的线性响应特性的最新测量结果,并预测了许多新的影响。

著录项

  • 来源
    《Physical review》 |2011年第14期|p.144514.1-144514.5|共5页
  • 作者单位

    Institute for Theoretical Physics and Astrophysics, University of Wurzburg, D-97074 Wurzburg, Germany,Low Temperature Laboratory, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland;

    Centro de Fisica de Materiales (CFM), Centro Mixto CSIC-UPV/EHU, Edificio Korta, Avenida de Tolosa 72, E-20018 San Sebastian, Spain,Donostia International Physics Center (DIPC), Manuel de Lardizbal 4, E-20018 San Sebastian, Spain;

    Departamento de Fisica Teorica de la Materia Condensada, Universidad Autonoma de Madrid, E-28049 Madrid, Spain;

    Low Temperature Laboratory, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    proximity effects; Andreev effect; SN and SNS junctions; tunneling phenomena; point contacts, weak links, josephson effects;

    机译:邻近效应;安德列夫效应;SN和SNS交界处;隧道现象;点接触;薄弱环节;约瑟夫森效应;

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