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arXiv 2211.06709cond-mat.supr-concond-mat.mes-hall
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半导体-超导体混合体体相中邻近效应的静电控制

Electrostatic control of the proximity effect in the bulk of semiconductor-superconductor hybrids

N. van Loo, G. P. Mazur, T. Dvir, G. Wang, R. C. Dekker, J. -Y. Wang, M. Lemang, C. Sfiligoj, A. Bordin, D. van Driel, G. Badawy, S. Gazibegovic, E. P. A. M. Ba… 展开作者

N. van Loo, G. P. Mazur, T. Dvir, G. Wang, R. C. Dekker, J. -Y. Wang, M. Lemang, C. Sfiligoj, A. Bordin, D. van Driel, G. Badawy, S. Gazibegovic, E. P. A. M. Bakkers, L. P. Kouwenhoven

AI总结:

本研究通过非局域光谱法在InSb/Al/Pt混合体中证实电场可调控半导体与超导体的耦合强度,从而控制体相诱导能隙及临界磁场,并探讨了交叉区域现象与拓扑相变的关系。

摘要:

半导体-超导体纳米线中的邻近效应预计会在半导体中产生诱导能隙。该诱导能隙的大小,连同自旋轨道耦合和$g$因子等半导体特性,取决于材料之间的耦合强度。已有预测表明,这种耦合可以通过电场进行调节。我们利用非局域光谱法在InSb/Al/Pt混合体中研究了这一现象。我们证明,这些混合体可以被调控至半导体与超导体强耦合的状态。在这种情况下,诱导能隙与Al/Pt壳层中的超导能隙相近,并且仅在高磁场下才闭合。相反,耦合可以被抑制,从而导致诱导能隙和临界磁场的显著减小。在强耦合与弱耦合 regimes 的交叉区域,我们观察到纳米线体相中诱导能隙的闭合与重新打开。与预期相反,这一过程并未伴随局域电导谱中零偏压峰的形成。因此,这不能明确归因于预期的拓扑相变,我们讨论了可能的替代解释。

英文摘要:

The proximity effect in semiconductor-superconductor nanowires is expected to generate an induced gap in the semiconductor. The magnitude of this induced gap, together with the semiconductor properties like the spin-orbit coupling and $g$\,-\,factor, depends on the coupling between the materials. It is predicted that this coupling can be adjusted through the use of electric fields. We study this phenomena in InSb/Al/Pt hybrids using nonlocal spectroscopy. We show that these hybrids can be tuned such that the semiconductor and superconductor are strongly coupled. In this case, the induced gap is similar to the superconducting gap in the Al/Pt shell and closes only at high magnetic fields. In contrast, the coupling can be suppressed which leads to a strong reduction of the induced gap and critical magnetic field. At the crossover between the strong-coupling and weak-coupling regimes, we observe the closing and reopening of the induced gap in the bulk of a nanowire. Contrary to expectations, it is not accompanied by the formation of zero-bias peaks in the local conductance spectra. As a result, this cannot be attributed conclusively to the anticipated topological phase transition and we discuss possible alternative explanations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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