论文标题
在临界电流以下的接近连接中揭示约瑟夫森涡流动力学
Revealing Josephson vortex dynamics in proximity junctions below critical current
论文作者
论文摘要
SNS Josephson连接夹由两个超导体夹在两个超导体中的薄薄非驱动金属（N）制成，通过将N的固有电子性质与S的超导相关性混合在一起，从而使新的量子功能能够通过接近度诱导的超导相关性。这些设备的电子性能由Andreev准颗粒[1]控制，在传统的SIS连接中，它们在两个S电极之间的绝缘屏障（I）中不存在任何电子状态。在这里，我们关注NB-CU-NB接近连接内部的Josephson Vortex（JV）运动，受到电流和磁场的影响。将同时提供的局部（磁力显微镜）和全局（传输）实验的结果与我们的数值模型进行了比较，从而揭示了JV运动的几种不同动态模式。其中之一分析并建议使用低脉冲逻辑和记忆元素的约瑟夫森电流的临界值低于约瑟夫森电流的临界值。
Made of a thin non-superconducting metal (N) sandwiched by two superconductors (S), SNS Josephson junctions enable novel quantum functionalities by mixing up the intrinsic electronic properties of N with the superconducting correlations induced from S by proximity. Electronic properties of these devices are governed by Andreev quasiparticles [1] which are absent in conventional SIS junctions whose insulating barrier (I) between the two S electrodes owns no electronic states. Here we focus on the Josephson vortex (JV) motion inside Nb-Cu-Nb proximity junctions subject to electric currents and magnetic fields. The results of local (Magnetic Force Microscopy) and global (transport) experiments provided simultaneously are compared with our numerical model, revealing the existence of several distinct dynamic regimes of the JV motion. One of them, identified as a fast hysteretic entry/escape below the critical value of Josephson current, is analyzed and suggested for low-dissipative logic and memory elements.
