约瑟夫森隧道结中的Fiske台阶和Abrikosov涡旋
Fiske Steps and Abrikosov Vortices in Josephson Tunnel Junctions
摘要：
本文从理论和实验两方面研究了具有不规则排列的Abrikosov涡旋的“小”约瑟夫森结的电流-电压特性中的Fiske共振。我们得到，在存在的Abrikosov涡的电磁波的共振相互作用，在一个结内激发，与交流约瑟夫森电流表现出Fiske步骤本身的电流-电压特性，即使在没有外部磁场。我们发现，电压位置的Fiske步骤是由结的大小，但Fiske步骤的大小取决于被困的Abrikosov涡的密度和它们的失调参数。我们测量了具有人工引入的Abrikosov涡旋的低耗散小型$Nb$约瑟夫森隧道结的第一费斯克台阶幅度和约瑟夫森临界电流的磁场依赖性。观察到约瑟夫森临界电流的强烈衰减和第一费斯克阶跃振幅对Abrikosov涡旋密度的弱非单调减小。实验观察到的依赖关系很好地描述了发达的理论。
英文摘要：
We present a theoretical and experimental study of the Fiske resonances in the current-voltage characteristics of "small" Josephson junctions with randomly distributed misaligned Abrikosov vortices. We obtained that in the presence of Abrikosov vortices the resonant interaction of electromagnetic waves, excited inside a junction, with the ac Josephson current manifests itself by Fiske steps in a current-voltage characteristics even in the absence of external magnetic field. We found that the voltage positions of the Fiske steps are determined by a junction size, but the Fiske step magnitudes depend both on the density of trapped Abrikosov vortices and on their misalignment parameter. We measured the magnetic field dependence of both the amplitude of the first Fiske step and the Josephson critical current of low-dissipative small $Nb$ based Josephson tunnel junctions with artificially introduced Abrikosov vortices. A strong decay of the Josephson critical current and a weak non-monotonic decrease of the first Fiske step amplitude on the Abrikosov vortex density were observed. The experimentally observed dependencies are well described by the developed theory.
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