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- W4296561738 abstract "We study superconductivity of electron systems with both spin and pseudospin-1/2 degrees of freedom. By solving linearized gap equations, we derive a weak coupling criterion for the even-parity spin-singlet pseudospin-triplet pairing. It can generally mix with the on-site $s$-wave pairing since both of them belong to the same symmetry representation ($A_{1g}$) and their mixture could naturally give rise to anisotropic intra-band pairing gap functions with or without nodes. This may directly explain why some of the iron-chalcogenide superconductors are fully gapped (e.g.~FeSe thin film) and some have nodes (e.g.~LaFePO and LiFeP). We also find that the anisotropy of gap functions can be enhanced when the principal rotation symmetry is spontaneously broken in the normal state such as nematicity, and the energetic stabilization of pseudospin-triplet pairings indicates the coexistence of nematicity and superconductivity. This could be applied to both bulk FeSe and magic-angle twisted bilayer graphene (MATBG) where nematicity is observed in experiments. For example, our theory predicts that MATBG may be a $(s+d)$-like nematic nodal superconductor, which is consistent with the V-shaped quasi-particle density of states observed in recent tunneling experiment [1]." @default.
- W4296561738 created "2022-09-21" @default.
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- W4296561738 date "2021-09-13" @default.
- W4296561738 modified "2023-10-16" @default.
- W4296561738 title "Pseudospin-Triplet Pairing in Iron-Chalcogenide Superconductors and Magic-Angle Twisted Bilayer Graphene" @default.
- W4296561738 doi "https://doi.org/10.48550/arxiv.2109.06039" @default.
- W4296561738 hasPublicationYear "2021" @default.
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