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arXiv 1905.01487cond-mat.supr-concond-mat.othercond-mat.str-el
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磁场作用下准晶超导体中的奇异配对态

Exotic pairing state in quasicrystalline superconductors under magnetic field

Shiro Sakai, Ryotaro Arita

摘要:

我们用彭罗斯平铺结构上的吸引哈伯德模型来模拟准晶超导体,从理论上研究了磁场对准晶超导体的影响。我们发现在低温和高磁场下,在实空间中出现了一个序参量变号的奇异超导态。我们讨论的状态与富尔德-费雷尔-拉金-奥夫钦尼科夫状态多年前提出的周期性系统,澄清共性和差异。值得注意的是,即使在没有周期性的情况下,电子系统也找到了一种方法来保持具有空间符号变化的序参量的相干超导态,与潜在的准周期结构兼容。

英文摘要:

We theoretically study the effect of a magnetic field on quasicrystalline superconductors, by modelling them as the attractive Hubbard model on the Penrose-tiling structure. We find that at low temperatures and under a high magnetic field there appears an exotic superconducting state with the order parameter changing its sign in real space. We discuss the state in comparison with the Fulde-Ferrell-Larkin-Ovchinnikov state proposed many years ago for periodic systems, clarifying commonalities and differences. It is remarkable that, even in the absence of periodicity, the electronic system finds a way to keep a coherent superconducting state with a spatially sign-changing order parameter compatible with the underlying quasiperiodic structure.

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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