Interface-induced superconductivity in magnetic topological insulators-猫眼课题宝

DOI：

10.1126/science.adk1270

发表时间：

2024-02

期刊：

Science

影响因子：

56.9

通讯作者：

中科院分区：

综合性期刊1区

文献类型：

作者：

H. Yi;Yi-Fan Zhao;Ying-Ting Chan;Jiaqi Cai;Ruobing Mei;Xianxin Wu;Zijun Yan;Lingjie Zhou;Ruoxi Zhang;Zihao Wang;Stephen Paolini;Run Xiao;Ke Wang;A. Richardella;John Singleton;Laurel E. Winter;T. Prokscha;Zaher Salman;Andreas Suter;P. Balakrishnan;A. Grutter;Moses H. W. Chan;N. Samarth;Xiaodong Xu;Weida Wu;Chaozhi Liu;Cui-Zu Chang

两种不同的材料之间的界面可以显示出意外的量子现象这些异质结构中出现的界面引起的超导性，并证明了超导性，铁磁性和磁性TI层中的拓扑结构 - 手性拓扑超导性的三种基本诱导性（TSC）。这些具有强大超导性和原子尖锐界面的磁性Ti/fete异质结构提供了理想探索手性TSC和Majorana Physics的晶圆级平台。磁性绝缘子（BI，SB）2TE3掺杂铬和抗磁性铁的层。铁尿酸盐是一种基于铁的超导体的家族，在存在铁磁性和拓扑结构的情况下导致超导性的出现。为了观察手性拓扑超导性 - Jelena Stajic超导性是通过将磁性拓扑绝缘子与抗铁磁性铁尿素连接起来的。

The interface between two different materials can show unexpected quantum phenomena. In this study, we used molecular beam epitaxy to synthesize heterostructures formed by stacking together two magnetic materials, a ferromagnetic topological insulator (TI) and an antiferromagnetic iron chalcogenide (FeTe). We observed emergent interface-induced superconductivity in these heterostructures and demonstrated the co-occurrence of superconductivity, ferromagnetism, and topological band structure in the magnetic TI layer—the three essential ingredients of chiral topological superconductivity (TSC). The unusual coexistence of ferromagnetism and superconductivity is accompanied by a high upper critical magnetic field that exceeds the Pauli paramagnetic limit for conventional superconductors at low temperatures. These magnetic TI/FeTe heterostructures with robust superconductivity and atomically sharp interfaces provide an ideal wafer-scale platform for the exploration of chiral TSC and Majorana physics. Editor’s summary One of the recipes for realizing topological superconductivity calls for interfacing a topological insulator with a superconductor. In a variant of that approach, Yi et al. grew a heterostructure consisting of layers of a magnetic topological insulator, (Bi,Sb)2Te3 doped with chromium, and antiferromagnetic iron telluride. Neither of these materials is superconducting, but iron telluride is a parent compound for a family of iron-based superconductors. Interfacing the layers led to the appearance of superconductivity in the presence of ferromagnetism and topological band structure. This combination of properties makes the heterostructure a promising, although not yet proven, platform for observing chiral topological superconductivity. —Jelena Stajic Superconductivity was induced by interfacing a magnetic topological insulator with antiferromagnetic iron telluride.

Interface-induced superconductivity in magnetic topological insulators

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