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arXiv 1012.4294cond-mat.supr-con
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扩散SNS结的线性AC响应

Linear AC Response of Diffusive SNS Junctions

Pauli Virtanen, F. Sebastián Bergeret, Juan Carlos Cuevas, Tero T. Heikkilä

摘要:

研究了超导体-正常金属-超导体(SNS)结的交流导纳随超导体间序参量相位差变化的行为。我们发现三个特征的制度,定义通过比较驱动频率$ω$的非弹性散射率$Γ$和无功能量$E_T$的交界处(通常$\hbarΓ\ll E_T$)。只有在第一种状态$ω\ll Γ$中,通常的动力学电感图才成立。我们表明,交流导纳可以用来直接访问的SNS结的一些特征量,特别是相位相关的能量minigap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最近测量的SNS超导量子干涉器件(SQUID)的线性响应特性,并预测了一些新的效果。

英文摘要:

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 comparing the driving frequency $ω$ to the inelastic scattering rate $Γ$ and the Thouless energy $E_T$ of the junction (typically $\hbarΓ\ll E_T$). Only in the first regime $ω\ll Γ$ the usual picture of the kinetic inductance holds. 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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