Topological ultranodal pair states in iron-based superconductors.,Nature Communications

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Topological ultranodal pair states in iron-based superconductors.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-27 , DOI: 10.1038/s41467-020-14357-2
Chandan Setty ₁ , Shinibali Bhattacharyya ₁ , Yifu Cao ₁ , Andreas Kreisel ₂ , P J Hirschfeld ₁

Affiliation

Bogoliubov Fermi surfaces are contours of zero-energy excitations that are protected in the superconducting state. Here we show that multiband superconductors with dominant spin singlet, intraband pairing of spin-1/2 electrons can undergo a transition to a state with Bogoliubov Fermi surfaces if spin-orbit coupling, interband pairing and time reversal symmetry breaking are also present. These latter effects may be small, but drive the transition to the topological state for appropriate nodal structure of the intra-band pair. Such a state should display nonzero zero-bias density of states and corresponding residual Sommerfeld coefficient as for a disordered nodal superconductor, but occurring even in the pure case. We present a model appropriate for iron-based superconductors where the topological transition associated with creation of a Bogoliubov Fermi surface can be studied. The model gives results that strongly resemble experiments on FeSe1-xSx across the nematic transition, where this ultranodal behavior may already have been observed.

中文翻译：

铁基超导体中的拓扑超节点对态。

Bogoliubov Fermi表面是零能量激发的轮廓，在超导状态下受到保护。在这里，我们显示，如果还存在自旋轨道耦合，带间配对和时间反转对称性破裂，则具有显性自旋单重态，自旋1/2电子的带内配对的多带超导体可能会转变为Bogoliubov Fermi表面状态。后面这些影响可能很小，但是会驱动向带内对的适当节点结构的拓扑状态过渡。对于无序的节点超导体，这种状态应显示非零的零偏置状态密度和相应的残余Sommerfeld系数，但即使在纯情况下也是如此。我们提出了一种适用于铁基超导体的模型，其中可以研究与Bogoliubov费米表面的产生有关的拓扑转变。该模型给出的结果与在整个向列跃迁上的FeSe1-xSx实验非常相似，在该实验中可能已经观察到这种超结行为。

更新日期：2020-01-27

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