论文标题
超电流干涉仪中的约瑟夫森二极管效应
The Josephson diode effect in supercurrent interferometers
论文作者
论文摘要
约瑟夫森二极管是一种非重点电路元件，它在一个方向上支持更大的无耗散超流量。在这项工作中，我们提出和理论上研究了一类基于含有中镜的约瑟夫森连接的超流动干涉仪的约瑟夫森二极管，例如点触点或量子点，这些二极管本身不是二极管本身，而是具有非肌体形的电流相关关系。我们表明，这样的约瑟夫森二极管具有几个重要的优势，例如是电气调谐的，不需要Zeeman分裂也不需要自旋轨道耦合，只有磁通量就会发生时间反转。我们还表明，我们的二极管具有特征性的AC响应，这是Shapiro Steps揭示的。即使是仅依赖两个连接的约瑟夫森二极管范式的最简单实现也可以实现高达$ \ sim40 \％$的效率，有趣的是，通过使多个干涉仪LOOPS可以实现更大的效率。
A Josephson diode is a non-reciprocal circuit element that supports a larger dissipationless supercurrent in one direction than in the other. In this work, we propose and theoretically study a class of Josephson diodes based on supercurrent interferometers containing mesoscopic Josephson junctions, such as point contacts or quantum dots, which are not diodes themselves but possess non-sinusoidal current-phase relations. We show that such Josephson diodes have several important advantages, like being electrically tunable and requiring neither Zeeman splitting nor spin-orbit coupling, only time-reversal breaking by a magnetic flux. We also show that our diodes have a characteristic AC response, revealed by the Shapiro steps. Even the simplest realization of our Josephson diode paradigm that relies on only two junctions can achieve efficiencies of up to $\sim40\%$ and, interestingly, far greater efficiencies are achievable by concatenating multiple interferometer loops.
