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arXiv 1103.2129cond-mat.supr-concond-mat.mes-hall
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p+ip超导体的工程设计:拓扑绝缘体和Rashba自旋轨道耦合材料的比较

Engineering a p+ip Superconductor: Comparison of Topological Insulator and Rashba Spin-Orbit Coupled Materials

Andrew C. Potter, Patrick A. Lee

摘要:

我们比较了拓扑绝缘体材料和Rashba耦合表面作为工程p+ip超导性的候选者。具体来说,在每种类型的材料中,我们研究了1)通过接近普通s波超导体来诱导超导性的限制,以及2)所产生的超导性对无序的鲁棒性。我们发现,拓扑绝缘体在这两方面都有很强的优势:诱导超导性没有基本的障碍,诱导的超导性是免疫的无序。相反,对于Rashba耦合的量子线或表面态,除非Rashba耦合很大,否则诱导超导性可实现的带隙是有限的。此外,对于小的Rashba耦合的诱导超导电性是非常容易受到无序。由于p+ip超导体的自旋-轨道耦合较弱,这些特征给在半导体材料中实现p+ip超导体带来了严重的困难,并表明需要寻找替代品。一些候选材料进行了讨论。

英文摘要:

We compare topological insulator materials and Rashba coupled surfaces as candidates for engineering p+ip superconductivity. Specifically, in each type of material we examine 1) the limitations to inducing superconductivity by proximity to an ordinary s-wave superconductor, and 2) the robustness of the resulting superconductivity against disorder. We find that topological insulators have strong advantages in both regards: there are no fundamental barriers to inducing superconductivity, and the induced superconductivity is immune to disorder. In contrast, for Rashba coupled quantum wires or surface states, the the achievable gap from induced superconductivity is limited unless the Rashba coupling is large. Furthermore, for small Rashba coupling the induced superconductivity is strongly susceptible to disorder. These features pose serious difficulties for realizing p+ip superconductors in semiconductor materials due to their weak spin-orbit coupling, and suggest the need to seek alternatives. Some candidate materials are discussed.

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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