论文标题
基于氧化物纳米通道的约瑟夫森连接中的非平凡拓扑的标志
Hallmarks of non-trivial topology in Josephson junctions based on oxide nanochannels
论文作者
论文摘要
我们研究了通过约束氧化物界面处的二维电子气体形成准1D导体来获得的约瑟夫森连接的拓扑特性。我们揭示了一个异常的临界电流行为，其磁场垂直于Rashba旋转轨道。我们将观察到的小磁场上观察到的临界电流增强与非平凡的拓扑结构，并伴随着固定在超导导线边缘的Majorana Bound态（MBS）。 MBS的签名还包括电流相关关系中的锯齿状剖面。我们的发现可以识别非中心对称材料和与Rashba旋转轨道相互作用的密闭系统中拓扑超导性的指纹，并解释了仍缺乏微观描述的最新实验观察结果。
We investigate the topological properties of a Josephson junction obtained by constraining a two-dimensional electron gas at oxide interface to form a quasi-1D conductor. We reveal an anomalous critical current behaviour with a magnetic field applied perpendicular to the Rashba spin-orbit one. We relate the observed critical current enhancement at small magnetic fields with a non-trivial topology, accompanied by Majorana bound states (MBSs) pinned at the edges of the superconducting leads. Signatures of MBSs also include a sawtooth profile in the current-phase relation. Our findings allow to recognize fingerprints of topological superconductivity in non-centrosymmetric materials and confined systems with Rashba spin-orbit interaction, and to explain recent experimental observations for which a microscopic description is still lacking.
