论文标题
二极管的二极管效应
Diode effects in current-biased Josephson junctions
论文作者
论文摘要
当前有偏见的约瑟夫森连接在耗散状态和超导状态之间表现出滞后转变，其特征是切换和翻新电流。在这里，我们开发了一种在弱阻尼的约瑟夫森连接的转换和翻译电流中的二极管样效应的理论。我们发现，虽然开关电流的二极管样行为植根于不对称的电流相关关系，但非转换电流的非对称电流源自不对称的准粒子电流。这些不同的起源也意味着对称要求明显不同。我们通过一个涉及单个磁原子的连接点的微观模型来说明我们的结果。我们的理论为识别约瑟夫森连接中非交流的微观起源提供了重要的指导。
Current-biased Josephson junctions exhibit hysteretic transitions between dissipative and superconducting states as characterized by switching and retrapping currents. Here, we develop a theory for diode-like effects in the switching and retrapping currents of weakly-damped Josephson junctions. We find that while the diode-like behavior of switching currents is rooted in asymmetric current-phase relations, nonreciprocal retrapping currents originate in asymmetric quasiparticle currents. These different origins also imply distinctly different symmetry requirements. We illustrate our results by a microscopic model for junctions involving a single magnetic atom. Our theory provides significant guidance in identifying the microscopic origin of nonreciprocities in Josephson junctions.
