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arXiv 2004.02226cond-mat.mes-hallcond-mat.mtrl-scicond-mat.supr-con
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铁磁混合纳米线中的零场拓扑超导性

Zero-field Topological Superconductivity in Ferromagnetic Hybrid Nanowires

S. Vaitiekėnas, Y. Liu, P. Krogstrup, C. M. Marcus

AI总结:

本研究通过输运与隧穿谱测量发现,Al/EuS 覆盖晶面重叠的 InAs 混合纳米线可在零外加磁场下产生约 1 T 的剩余有效 Zeeman 场并出现稳定零偏压电导峰,从而实现零场拓扑超导。

摘要:

我们报告了在半导体 InAs 纳米线上生长、带有超导 Al 和铁磁绝缘体 EuS 外延层的混合纳米线中的输运测量和隧穿谱结果。在 Al 与 EuS 覆盖晶面发生重叠的器件中,我们推断存在约 1 T 的剩余有效 Zeeman 场,并在进入纳米线端部的隧穿谱中观察到稳定的零偏压电导峰,这与零外加场下的拓扑超导性相符。临界电流和隧穿谱随外加磁场变化的迟滞特征支持了这一图像。Al 与 EuS 覆盖晶面不重叠的纳米线没有表现出可相比的特征。零外加场下的拓扑超导性使新型器件几何结构和控制方式成为可能。

英文摘要:

We report transport measurements and tunneling spectroscopy in hybrid nanowires with epitaxial layers of superconducting Al and the ferromagnetic insulator EuS, grown on semiconducting InAs nanowires. In devices where the Al and EuS covered facets overlap, we infer a remanent effective Zeeman field of order 1 T, and observe stable zero-bias conductance peaks in tunneling spectroscopy into the end of the nanowire, consistent with topological superconductivity at zero applied field. Hysteretic features in critical current and tunneling spectra as a function of applied magnetic field support this picture. Nanowires with non-overlapping Al and EuS covered facets do not show comparable features. Topological superconductivity in zero applied field allows new device geometries and types of control.

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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