半导体–铁磁绝缘体–超导体纳米线：杂散场与交换场
Semiconductor - Ferromagnetic Insulator - Superconductor Nanowires: Stray Field and Exchange Field
AI总结：
本文制备并研究 InAs/EuS/Al 半导体–铁磁绝缘体–超导体纳米线异质结构，揭示其外延匹配、单磁畴杂散场调控及硬超导能隙与磁交换场特征。
摘要：
纳米线可作为在选定晶面上进行混合外延生长的柔性衬底，从而允许设计具有复杂材料组合和几何结构的异质结构。在本工作中，我们报道了半导体–铁磁绝缘体–超导体（InAs/EuS/Al）纳米线异质结构的混合外延。我们研究了纤锌矿 InAs/岩盐 EuS 界面以及岩盐 EuS/面心立方 Al 界面的晶体生长和复杂外延匹配。由于源自纳米线形状的磁各向异性，EuS 相的磁结构很容易被调谐为单个磁畴。这一效应有效地将杂散场线沿纳米线排出。通过对态密度进行隧道谱测量，我们表明该材料具有硬的诱导超导能隙，以及磁滞演化，后者表明磁交换场不可忽略。这些混合纳米线满足了作为自旋量子应用平台的关键材料要求，例如可扩展拓扑量子计算。
英文摘要：
Nanowires can serve as flexible substrates for hybrid epitaxial growth on selected facets, allowing for design of heterostructures with complex material combinations and geometries. In this work we report on hybrid epitaxy of semiconductor - ferromagnetic insulator - superconductor (InAs/EuS/Al) nanowire heterostructures. We study the crystal growth and complex epitaxial matching of wurtzite InAs / rock-salt EuS interfaces as well as rock-salt EuS / face-centered cubic Al interfaces. Because of the magnetic anisotropy originating from the nanowire shape, the magnetic structure of the EuS phase are easily tuned into single magnetic domains. This effect efficiently ejects the stray field lines along the nanowires. With tunnel spectroscopy measurements of the density of states, we show the material has a hard induced superconducting gap, and magnetic hysteretic evolution which indicates that the magnetic exchange fields are not negligible. These hybrid nanowires fulfil key material requirements for serving as a platform for spin-based quantum applications, such as scalable topological quantum computing.
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