Zero-field Topological Superconductivity in Ferromagnetic Hybrid Nanowires
Zero-field Topological Superconductivity in Ferromagnetic Hybrid Nanowires
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发表时间：
2020-04
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通讯作者：
S. Vaitiek.enas;Y. Liu;P. Krogstrup;C. Marcus
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作者：
S. Vaitiek.enas;Y. Liu;P. Krogstrup;C. Marcus
我们报告的传输测量和隧道光谱的混合纳米线与外延层的超导铝和铁磁绝缘体EuS，生长在半导体InAs纳米线。在设备中的Al和EuS覆盖面重叠，我们推断一个recruitment有效的塞曼场的顺序1 T，并观察到稳定的零偏置电导峰的隧道光谱到纳米线的末端，符合拓扑超导在零外加电场。临界电流和隧穿谱中的滞后特性作为外加磁场的函数支持这一观点。具有非重叠的Al和EuS覆盖面的纳米线不显示可比较的特征。零外加磁场中的拓扑超导性允许新的器件几何形状和控制类型。
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.