论文标题
磁场独立的亚漏水状态在混合Rashba纳米线中
Magnetic field independent sub-gap states in hybrid Rashba nanowires
论文作者
论文摘要
在半导体 - 驱动器中的纳米线混合设备中的子差距状态被争议地讨论为潜在的拓扑非平凡量子状态。歧义的一种来源是缺乏能量和空间定义良好的隧道光谱仪。在这里，我们使用在生长过程中直接集成到纳米线的量子点在长纳米线段中对离散亚间隙状态进行隧道光谱。除了具有标准磁场依赖性的亚间隙状态外，我们还发现了独立于外部磁场的拓扑上的亚间隙状态，即被固定在恒定能量中，作为磁场的函数。我们通过考虑纳米线中强的自旋轨道相互作用来定性和定量解释这种效果，这可能导致Andreev绑定的状态从野外脱钩，这是由于受封闭特征的空间自旋纹理而导致的。
Sub-gap states in semiconducting-superconducting nanowire hybrid devices are controversially discussed as potential topologically non-trivial quantum states. One source of ambiguity is the lack of an energetically and spatially well defined tunnel spectrometer. Here, we use quantum dots directly integrated into the nanowire during the growth process to perform tunnel spectroscopy of discrete sub-gap states in a long nanowire segment. In addition to sub-gap states with a standard magnetic field dependence, we find topologically trivial sub-gap states that are independent of the external magnetic field, i.e. that are pinned to a constant energy as a function of field. We explain this effect qualitatively and quantitatively by taking into account the strong spin-orbit interaction in the nanowire, which can lead to a decoupling of Andreev bound states from the field due to a spatial spin texture of the confined eigenstates.
