发表机构
MESA+ Institute, University of Twente; Department of Applied Physics, Eindhoven University of Technology; II. Physikalisches Institut, Universität zu Köln; Eurofins Materials Science Eindhoven; IBM Research Europe Zürich（特温特大学 MESA+ 研究所; 埃因霍温理工大学应用物理系; 科隆大学第二物理研究所; 欧洲分析检测材料科学埃因霍温; IBM 苏黎世欧洲研究中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文研究InP衬底上选择性区域生长的SnTe纳米线中的感应超导电性，发现铟扩散形成的InxSn1-xTe层导致超导，但未观察到拓扑超导态的半周期位移。
AI 中文摘要
拓扑超导体在拓扑量子计算应用中备受关注。所需的拓扑超导态可以通过在拓扑绝缘体中邻近感应超导电性来实现。本文通过TEM/EDX和低温电子输运研究，探索了在InP衬底上选择性区域生长的拓扑晶体绝缘体SnTe纳米线中的感应超导电性。观察到的超导行为可能源于衬底中的铟向上扩散进入SnTe纳米线，在纳米线与衬底之间的界面形成一层薄的InxSn1-xTe。当铟浓度高于2%时，InxSn1-xTe本质上是超导的，从而在异质结构中产生超导电性。在面外磁场中，环形纳米线网络中观察到Little-Parks振荡。未观察到指示拓扑超导态的半周期位移，这归因于占主导的平凡输运通道掩盖了任何拓扑特征。
英文摘要
Topological superconductors are of high interest for applications in topological quantum computation. The required topologically superconducting state can be engineered by proximityinducing superconductivity in a topological insulator. Here, we explore the induced superconductivity in selective-area grown nanowires of the topological crystalline insulator SnTe on a InP substrate, through TEM/EDX and low-temperature electronic transport studies. The observed superconducting behavior likely originates from indium in the substrate diffusing upwards into the SnTe nanowire, forming a thin layer of InxSn1-xTe at the interface between the nanowire and the substrate. InxSn1-xTe is intrinsically superconducting for indium concentrations above 2%, resulting in superconductivity within the heterostructure. Little-Parks oscillations are observed in loop-shaped nanowire networks in an out-of-plane magnetic field. The half-period shift indicative of a topological superconducting state is absent, which is explained by dominant trivial transport channels obscuring any topological signatures.
Comments13, 13 pages; 5, 12 figures
