Magnetic-Field-Independent Subgap States in Hybrid Rashba Nanowires.,Physical Review Letters

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Magnetic-Field-Independent Subgap States in Hybrid Rashba Nanowires.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-06-30 , DOI: 10.1103/physrevlett.125.017701
Christian Jünger ₁ , Raphaëlle Delagrange ₁ , Denis Chevallier ₁ , Sebastian Lehmann ₂ , Kimberly A Dick _{2,

3} , Claes Thelander ₂ , Jelena Klinovaja ₁ , Daniel Loss ₁ , Andreas Baumgartner _{1,

4} , Christian Schönenberger _{1,

4}

Affiliation

Subgap states in semiconducting-superconducting nanowire hybrid devices are controversially discussed as potential topologically nontrivial 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 subgap states in a long nanowire segment. In addition to subgap states with a standard magnetic field dependence, we find topologically trivial subgap 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. This result constitutes an important step forward in the research on superconducting subgap states in nanowires, such as Majorana bound states.

中文翻译：

混合Rashba纳米线中与磁场无关的亚隙状态。

有争议地将半导体-超导纳米线混合器件中的亚能隙状态讨论为潜在的拓扑非平凡的量子态。模糊性的一个来源是缺乏在能量和空间上明确定义的隧道光谱仪。在这里，我们使用在生长过程中直接集成到纳米线中的量子点来对长纳米线段中的离散子能级状态进行隧道光谱分析。除了具有标准磁场相关性的子能隙状态外，我们还发现拓扑上琐碎的子能隙状态与外部磁场无关，也就是被固定为恒定能量的场函数。我们考虑到纳米线中强烈的自旋轨道相互作用，定性和定量地解释了这种效应，由于局限本征态的空间自旋纹理，这可能导致Andreev束缚态与场解耦。这一结果构成了纳米线超导亚隙态（如马约拉纳束缚态）研究的重要一步。

更新日期：2020-06-30

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