论文标题
铁磁混合纳米线的零场拓扑超导性
Zero-field Topological Superconductivity in Ferromagnetic Hybrid Nanowires
论文作者
论文摘要
我们报告了与超导AL和铁磁绝缘子EUS的外延层层的混合纳米线中的运输测量和隧道光谱，该层是在半导体的INAS纳米线上生长的。在AL和EUS覆盖面重叠的设备中，我们推断出remanent的有效Zeeman阶列1 t，并观察到隧道光谱中的稳定的零偏置电导峰到纳米线的末端，与零施加场的拓扑超导性一致。临界电流和隧穿光谱中的滞后特征是施加磁场的函数，支持此图片。具有非重叠Al和EUS覆盖面的纳米线没有显示出可比的功能。零应用领域中的拓扑超导性允许新的设备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.
