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arXiv 2202.10230cond-mat.supr-concond-mat.mes-hall
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铝基超导-半导体混合材料中自旋混合增强的邻近效应

Spin-mixing enhanced proximity effect in aluminum-based superconductor-semiconductor hybrids

G. P. Mazur, N. van Loo, J. Y. Wang, T. Dvir, G. Wang, A. Khindanov, S. Korneychuk, F. Borsoi, R. C. Dekker, G. Badawy, P. Vinke, S. Gazibegovic, E. P. A. M. Ba… 展开作者

G. P. Mazur, N. van Loo, J. Y. Wang, T. Dvir, G. Wang, A. Khindanov, S. Korneychuk, F. Borsoi, R. C. Dekker, G. Badawy, P. Vinke, S. Gazibegovic, E. P. A. M. Bakkers, M. Quintero-Perez, S. Heedt, L. P. Kouwenhoven

摘要:

在超导量子线路中,铝是应用最广泛的材料之一。它目前也是发展拓扑量子比特的首选超导体。然而,在该应用中,铝基器件具有差的磁场兼容性。在这篇文章中,我们解决了这个限制表明,吸附原子的重元素(如铂)增加了临界场的薄铝膜的两个以上的因素。使用隧道结,我们表明,增加的场弹性来自自旋轨道散射引入的Pt。我们利用这一属性的上下文中的超导邻近效应的超导体-超导体的混合体,在那里我们表明,强烈耦合到Al/Pt膜的InSb纳米线可以保持超导性高达7 T。双电子充电效应,拓扑量子计算的基本要求,被证明是强大的对重吸附原子的存在。此外,我们使用非本地光谱在一个三端几何探测大部分的混合设备,表明它仍然没有子间隙状态。最后,我们证明了被Al/Pt膜近似的半导体态在外加磁场中保持塞曼分裂的能力。结合铝的化学稳定性和众所周知的制造路线,Al/Pt成为铝基系统的天然继承者,并且在需要高场弹性时是其他超导体的令人信服的替代品。

英文摘要:

In superconducting quantum circuits, aluminum is one of the most widely used materials. It is currently also the superconductor of choice for the development of topological qubits. In this application, however, aluminum-based devices suffer from poor magnetic field compatibility. In this article, we resolve this limitation by showing that adatoms of heavy elements (e.g. platinum) increase the critical field of thin aluminum films by more than a factor of two. Using tunnel junctions, we show that the increased field resilience originates from spin-orbit scattering introduced by Pt. We exploit this property in the context of the superconducting proximity effect in semiconductor-superconductor hybrids, where we show that InSb nanowires strongly coupled to Al/Pt films can maintain superconductivity up to 7T. The two-electron charging effect, a fundamental requirement for topological quantum computation, is shown to be robust against the presence of heavy adatoms. Additionally, we use non-local spectroscopy in a three-terminal geometry to probe the bulk of hybrid devices, showing that it remains free of sub-gap states. Finally, we demonstrate that semiconductor states which are proximitized by Al/Pt films maintain their ability to Zeeman-split in an applied magnetic field. Combined with the chemical stability and well-known fabrication routes of aluminum, Al/Pt emerges as the natural successor to Al-based systems and is a compelling alternative to other superconductors, whenever high-field resilience is required.

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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