论文标题
正常金属接触诱导的II型Weyl-Semimetal WTE2的超导性
Superconductivity in type-II Weyl-semimetal WTe2 induced by a normal metal contact
论文作者
论文摘要
wte $ _2 $是具有丰富拓扑特性的材料：它是单层的2D拓扑绝缘子，是散装形式的单层和高级和高阶拓扑绝缘子（HOTI）。在拓扑材料中诱导超导性是获得拓扑超导性的一种方法，这是为许多耐受量量子计算的建议奠定的基础。在这里，我们证明了WTE $ _2 $和普通金属钯之间的界面上超导性的出现。超导性的临界温度约为1.2 K。通过研究垂直磁场中的超导性，我们获得了连贯的长度和伦敦穿透深度。这些参数对应于费米速度低的速度和高密度在费米水平上。这暗示着由于扁平带的形成而导致超导性的可能起源。此外，临界面内磁场超过了保利极限，表明超导状态的非平凡性质。
WTe$_2$ is a material with rich topological properties: it is a 2D topological insulator as a monolayer and a Weyl-semimetal and higher-order topological insulator (HOTI) in the bulk form. Inducing superconductivity in topological materials is a way to obtain topological superconductivity, which lays at the foundation for many proposals of fault tolerant quantum computing. Here, we demonstrate the emergence of superconductivity at the interface between WTe$_2$ and the normal metal palladium. The superconductivity has a critical temperature of about 1.2 K. By studying the superconductivity in perpendicular magnetic field, we obtain the coherence length and the London penetration depth. These parameters correspond to a low Fermi velocity and a high density of states at the Fermi level. This hints to a possible origin of superconductivity due to the formation of flat bands. Furthermore, the critical in-plane magnetic field exceeds the Pauli limit, suggesting a non-trivial nature of the superconducting state.
