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arXiv 2301.11652cond-mat.supr-concond-mat.mes-hall
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具有本征p波配对或非平凡带拓扑的二维超导体

Two-dimensional superconductors with intrinsic p-wave pairing or nontrivial band topology

Wei Qin, Jiaqing Gao, Ping Cui, Zhenyu Zhang

摘要:

在过去的15年里,人们一直致力于在现实材料和系统中实现拓扑超导性,主要是因为它们在容错量子信息处理中具有广阔的应用前景。在这篇文章中,我们试图给出一个概述在这一领域的一些主要发展,特别是在二维晶体超导体,具有固有的p波配对或非平凡带拓扑。我们首先分类三种不同的概念方案,以实现拓扑超导体(TSC),使通过实空间超导邻近效应,倒空间超导邻近效应,和本征TSC。虽然第一种方案迄今已得到最广泛的探讨,但其他两种方案之间的微妙差异仍有待充分证实。然后,我们转向候选的本征或p波超导体,包括Sr2RuO4,UTe2,Pb3Bi和石墨烯为基础的系统。对于依赖邻近效应的TSC系统,重点主要是超导性和非平凡能带拓扑结构的共存,例如过渡金属二硫属化物,钴pnictides,和锡烯,都在单层或少层制度。审查完成与讨论的应变,门控和铁电性的三个主要调谐方案在获取TSC的一个或两个基本成分,和优化这种调谐能力可能被证明是决定性的,在我们的驱动器编织的马约拉纳零模式和演示的拓扑量子位。

英文摘要:

Over the past fifteen years, tremendous efforts have been devoted to realizing topological superconductivity in realistic materials and systems, predominately propelled by their promising application potentials in fault-tolerant quantum information processing. In this article, we attempt to give an overview on some of the main developments in this field, focusing in particular on two-dimensional crystalline superconductors that possess either intrinsic p-wave pairing or nontrivial band topology. We first classify the three different conceptual schemes to achieve topological superconductor (TSC), enabled by real-space superconducting proximity effect, reciprocal-space superconducting proximity effect, and intrinsic TSC. Whereas the first scheme has so far been most extensively explored, the subtle difference between the other two remains to be fully substantiated. We then move on to candidate intrinsic or p-wave superconductors, including Sr2RuO4, UTe2, Pb3Bi, and graphene-based systems. For TSC systems that rely on proximity effects, the emphases are mainly on the coexistence of superconductivity and nontrivial band topology, as exemplified by transition metal dichalcogenides, cobalt pnictides, and stanene, all in monolayer or few-layer regime. The review completes with discussions on the three dominant tuning schemes of strain, gating, and ferroelectricity in acquiring one or both essential ingredients of the TSC, and optimizations of such tuning capabilities may prove to be decisive in our drive towards braiding of Majorana zero modes and demonstration of topological qubits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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