Exotic pairing state in quasicrystalline superconductors under a magnetic field
Exotic pairing state in quasicrystalline superconductors under a magnetic field
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磁场下准晶超导体的奇异配对状态
DOI：
10.1103/physrevresearch.1.022002
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发表时间：
2019
影响因子：
4.2
通讯作者：
Shiro Sakai and Ryotaro Arita
中科院分区：
文献类型：
--
作者：
Satsukawa Takako;Godard Marguerite;Demouchy Sylvie;Michibayashi Katsuyoshi;Ildefonse Benoit;山中 卓;Mitsuo Hara;Shiro Sakai and Ryotaro Arita
我们从理论上研究了磁场对准晶超导体的影响，通过将它们建模为彭罗斯平铺结构上的有吸引力的Hubbard模型。我们发现在低温和强磁场下，在真实的空间中出现了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与潜在准周期结构兼容的空间符号变化序参数的相干超导态。
We theoretically study the effect of a magnetic field on quasicrystalline superconductors, by modeling them as an attractive Hubbard model on a 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.