论文标题
通量可调状态诱导的全壳纳米线中的非血管学零偏置峰
Nontopological zero-bias peaks in full-shell nanowires induced by flux tunable Andreev states
论文作者
论文摘要
已经提出了一个被超导壳完全包裹的半导体纳米线，以作为在小磁场处获得Majoraana模式的平台。在这项研究中，我们证明了该结构中子段状态的出现实际上受隧道光谱测量中的连接区域的控制，而不是全壳纳米线本身。短隧道区域永远不会显示子段状态，而较长的连接总是这样做。这可以通过在Yu-Shiba-Rusinov制度中的结中形成的量子点来理解。通过Zeeman和Little-Parks效应，Andreev水平的复杂磁场依赖性可能会导致稳健的零偏置峰，这些峰可能很容易被误解为源自Majorana零模式，但与拓扑超导性无关。
A semiconducting nanowire fully wrapped by a superconducting shell has been proposed as a platform for obtaining Majorana modes at small magnetic fields. In this study, we demonstrate that the appearance of subgap states in such structures is actually governed by the junction region in tunneling spectroscopy measurements, and not the full-shell nanowire itself. Short tunneling regions never show subgap states, whereas longer junctions always do. This can be understood in terms of quantum dots forming in the junction and hosting Andreev levels in the Yu-Shiba-Rusinov regime. The intricate magnetic field dependence of the Andreev levels, through both the Zeeman and Little-Parks effects, may result in robust zero-bias peaks, features that could be easily misinterpreted as originating from Majorana zero modes, but are unrelated to topological superconductivity.
