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Dynamics of superconducting nanowires shunted with an external resistor

机译：与外部电阻器并联的超导纳米线的动力学

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摘要

We present a study of superconducting nanowires shunted with an external resistor, geared towards understanding and controlling coherence and dissipation in nanowires. The dynamics is probed by measuring the evolution of the V-I characteristics and the distributions of switching and retrapping currents upon varying the shunt resistor and temperature. Theoretical analysis of the experiments indicates that as the value of the shunt resistance is decreased, the dynamics turns more coherent, presumably due to stabilization of phase-slip centers in the wire, and furthermore the switching current approaches the Bardeen's prediction for equilibrium depairing current. By a detailed comparison between theory and experiment, we make headway into identifying regimes in which the quasi-one-dimensional wire can effectively be described by a zero-dimensional circuit model analogous to the resistively and capacitively shunted Josephson junction model of Stewart and McCumber. Aside from its fundamental significance, our study has implications for a range of promising technological applications.
机译：我们提出了一个与外部电阻器并联的超导纳米线的研究，旨在理解和控制纳米线的相干性和耗散性。通过测量V-I特性的演变以及在改变分流电阻器和温度时的开关电流和重新捕获电流的分布来探究动态特性。实验的理论分析表明，随着分流电阻值的减小，动力学转向更加连贯，这大概是由于导线中的相移中心稳定所致，此外，开关电流接近Bardeen对平衡去耦电流的预测。通过理论和实验之间的详细比较，我们在确定可以通过类似于Stewart和McCumber的电阻分流和电容分流的约瑟夫森结模型的零维电路模型有效描述准一维导线的方式方面取得了进展。除了其根本意义外，我们的研究还对一系列有前景的技术应用产生了影响。

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  • 来源
    《Physical review》 |2012年第22期|p.224507.1-224507.13|共13页
  • 作者

    Matthew W. Brenner; Dibyendu Roy; Nayana Shah; Alexey Bezryadin;

  • 作者单位

    University of Illinois at Urbana-Champaign, Department of Physics, Urbana, Illinois 61801, USA;

    Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA;

    Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA;

    University of Illinois at Urbana-Champaign, Department of Physics, Urbana, Illinois 61801, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    mesoscopic and nanoscale systems; critical currents;

    机译：介观和纳米系统;临界电流;

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