Abstract

We study the influence of the accumulation layer on the spectral properties of semiconducting nanowires fully covered by a superconducting shell within the framework of the Bogoliubov–de Gennes equations. It is shown that both the decrease in the thickness of the layer and the increase in the ratio of the Fermi velocities in the shell and the core result in the enhancement of the spectral gap and restrict the parameter range corresponding to the topologically nontrivial phase. The presence of the accumulation layer can also lead to reentrant magnetic flux dependencies of the gap, which can be experimentally observed in measurements of charge transport through the nanowire in the Coulomb blockade conditions.

中文翻译：

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堆积层对全壳马约拉纳纳米线光谱特性的影响

摘要

我们在Bogoliubov-de Gennes方程的框架内研究了积聚层对被超导壳完全覆盖的半导体纳米线的光谱特性的影响。结果表明，层厚度的减小以及壳和核中费米速度比的增加都导致光谱间隙的增加，并限制了与拓扑无关的相对应的参数范围。积累层的存在还可以导致间隙的折返磁通依赖性，这可以在库仑阻塞条件下通过纳米线进行的电荷传输测量中通过实验观察到。