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Dissipation-enabled fractional Josephson effect

机译：启用耗散的分数约瑟夫森效应

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摘要

The anomalous 4π-periodic ac Josephson effect, a hallmark of topological Josephson junctions, was experimentally observed in a quantum spin Hall insulator. This finding is unexpected due to time-reversal symmetry preventing the backscattering of the helical edge states and therefore suppressing the 47π-periodic component of the Josephson current. Here, we analyze the two-particle inelastic scattering as a possible explanation for this experimental finding. We show that a sufficiently strong inelastic scattering restores the 4π-periodic component of the current beyond the short Josephson junction regime. Its signature is an observable peak in the power spectrum of the junction at half the Josephson frequency. We propose to use the exponential dependence of the peak width on the applied bias and the magnitude of the dc current as means of verifying that the inelastic scattering is indeed the mechanism responsible for the 4π-periodic signal.
机译：在量子自旋霍尔绝缘体中通过实验观察到异常的4π周期ac约瑟夫森效应，这是拓扑约瑟夫森结的标志。由于时间反转对称性防止了螺旋边缘态的反向散射，因此抑制了约瑟夫森电流的47π周期分量，因此这一发现是出乎意料的。在这里，我们分析两粒子非弹性散射作为对此实验发现的可能解释。我们表明，足够强的非弹性散射可在短的约瑟夫森结型区域之外恢复电流的4π-周期分量。它的特征是结的功率谱中约瑟夫森频率的一半处可观察到的峰值。我们建议使用峰宽对施加的偏压和直流电流大小的指数依赖性作为手段来验证非弹性散射确实是造成4π周期信号的机制。

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  • 来源
    《Physical review》 |2018年第12期|125124.1-125124.16|共16页
  • 作者

    Doru Sticlet; Jay D. Sau; Anton Akhmerov;

  • 作者单位

    Kavli Institute of Nanoscience, Delft University of Technology, P. O. Box 4056, 2600 GA Delft, The Netherlands,National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, 400293 Cluj-Napoca, Romania;

    Department of Physics, Condensed Matter Theory Center and the Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA;

    Kavli Institute of Nanoscience, Delft University of Technology, P. O. Box 4056, 2600 GA Delft, The Netherlands;

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