论文标题

基于铝的超导体 - 触发器杂种的旋转混合增强的接近效应

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

论文作者

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

论文摘要

在超导量子电路中,铝是使用最广泛的材料之一。目前,它也是开发拓扑量表的首选超导体。但是,在此应用中,基于铝的设备兼容磁场兼容性不佳。在本文中,我们通过表明沉重元素(例如铂)的沉积物将薄铝膜的临界场提高了两倍以上,从而解决了这一限制。使用隧道连接,我们表明,增加的场弹性起源于PT引入的自旋轨道散射。我们在半导体 - 螺旋体杂种中的超导接近效应的背景下利用了这一特性,在那里我们表明,与Al/pt膜密切相关的纳米线可以保持高达7T的超导性。两电子充电效应是拓扑量子计算的基本要求,与沉积物的存在相对于存在。此外,我们在三端几何形状中使用非局部光谱探测大部分杂种装置,表明它仍然不含亚间隙状态。最后,我们证明了由Al/PT膜邻近的半导体状态保持其在应用磁场中的Zeeman分割的能力。结合铝的化学稳定性和众所周知的制造途径,Al/PT成为基于AL系统的天然后继者,并且在需要高场弹性时,是其他超导体的引人注目的替代方案。

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.

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