AI 中文总结
研究基于FeTe的异质结构中界面诱导超导性，通过分子束外延生长双层膜并结合多种测量手段。发现超导性在整个成分范围稳健，转变温度近12K，超流刚度与相邻层拓扑等无关且局限于界面，为探索拓扑超导性等提供平台。
AI 中文摘要
基于FeTe的异质结构中的界面诱导超导性为拓扑超导性提供了一条有前景的途径，但相邻层的拓扑、对称性和电子结构的作用仍未解决。在这项工作中，我们采用分子束外延生长Pb1-xSnxTe/FeTe双层膜，并使用角分辨光电子能谱追踪Pb1-xSnxTe层从平凡绝缘体到承载多个狄拉克表面态的拓扑晶体绝缘体的演变。电输运测量揭示了在整个成分范围内的稳健超导性，尽管Pb1-xSnxTe的电子结构和拓扑发生了重大变化，超导转变温度仍接近恒定的~12K。双线圈互感测量进一步揭示了在拓扑相变过程中相当的超流刚度，并且尽管组成层厚度有很大变化，但超流刚度几乎与厚度无关，表明超导性局限于界面附近。这些结果表明，基于FeTe的异质结构中的超导性在很大程度上对相邻层的拓扑、晶体对称性和详细电子结构不敏感，支持主要起源于对FeTe层的修饰。Pb1-xSnxTe/FeTe双层膜中界面受限超导性和可调谐多个狄拉克表面态的共存为探索拓扑超导性和多个马约拉纳零模之间的相互作用提供了一个通用平台。
英文摘要
Interface-induced superconductivity in FeTe-based heterostructures provides a promising route toward topological superconductivity, yet the roles of the neighboring layers topology, symmetry, and electronic structure remain unresolved. In this work, we employ molecular beam epitaxy to grow Pb1-xSnxTe/FeTe bilayers and use angle-resolved photoemission spectroscopy to track the evolution of the Pb1-xSnxTe layer from a trivial insulator to a topological crystalline insulator hosting multiple Dirac surface states. Electrical transport measurements reveal robust superconductivity throughout the entire composition range, with a nearly constant superconducting transition temperature of ~12 K despite substantial changes in the electronic structure and topology of Pb1-xSnxTe. Double-coil mutual-inductance measurements further reveal comparable superfluid stiffness across the topological phase transition and nearly thickness-independent superfluid stiffness despite large variations in the constituent-layer thicknesses, demonstrating that superconductivity is confined near the interface. These results establish that superconductivity in FeTe-based heterostructures is largely insensitive to the topology, crystal symmetry, and detailed electronic structure of the neighboring layer, supporting a primary origin in modifications to the FeTe layer. The coexistence of interface-confined superconductivity and tunable multiple Dirac surface states in Pb1-xSnxTe/FeTe bilayers provides a versatile platform for exploring topological superconductivity and interactions among multiple Majorana zero modes.
Comments30 pages, 4 figures. Comments are very much welcome
