论文标题
$ 0- $ 0-约瑟夫森连接的证据来自sn-insb纳米线的偏差衍射模式
Evidence of $ϕ$0-Josephson junction from skewed diffraction patterns in Sn-InSb nanowires
论文作者
论文摘要
我们根据带有SN壳的INSB纳米线研究Josephson连接。我们观察到倾斜的临界电流衍射模式：正向和反向电流偏置中的最大值处于不同的磁通量，位移为20-40吨。当外部磁场几乎垂直于纳米线，在基板平面上，偏斜是最大的。这种方向表明自旋轨道相互作用起作用。我们开发了一个现象学模型并执行紧密结合计算，这两种方法都重现了实验的基本特征。建模的效果是$ 0- $ 0-约瑟夫森交界处，具有高阶Josephson Harmonics。该系统对主要研究很感兴趣：影响要么是拓扑超导性的先驱或伴随的。缺乏反转对称性的电流相关关系也可以用于设计具有工程非线性的量子电路。
We study Josephson junctions based on InSb nanowires with Sn shells. We observe skewed critical current diffraction patterns: the maxima in forward and reverse current bias are at different magnetic flux, with a displacement of 20-40 mT. The skew is greatest when the external field is nearly perpendicular to the nanowire, in the substrate plane. This orientation suggests that spin-orbit interaction plays a role. We develop a phenomenological model and perform tight-binding calculations, both methods reproducing the essential features of the experiment. The effect modeled is the $ϕ$0-Josephson junction with higher-order Josephson harmonics. The system is of interest for Majorana studies: the effects are either precursor to or concomitant with topological superconductivity. Current-phase relations that lack inversion symmetry can also be used to design quantum circuits with engineered nonlinearity.
