Resilient nodeless $d$-wave superconductivity in monolayer FeSe

Abstract

Monolayer FeSe exhibits the highest transition temperature among the iron based superconductors and appears to be fully gapped, seemingly consistent with $s$-wave superconductivity. Here, we develop a theory for the superconductivity based on coupling to fluctuations of checkerboard magnetic order (which has the same translation symmetry as the lattice). The electronic states are described by a symmetry based $\mathbf{k}\cdot \mathbf{p}$-like theory and naturally account for the states observed by angle resolved photoemission spectroscopy. We show that a prediction of this theory is that the resultant superconducting state is a fully gapped, nodeless, $d$-wave state. This state, which would usually have nodes, stays nodeless because, as seen experimentally, the relevant spin-orbit coupling term has an energy scale smaller than the superconducting gap.

arXiv comment11 pages, 6 figures, and 2 tables. To appear in Physical Review Letters

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• Nematic superconductivity in magic-angle twisted bilayer graphene from atomistic modeling
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• Classification of Symmetry Derived Pairing at M Point in FeSe
• Multiorbital singlet pairing and $d+d$ superconductivity
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• Superconductivity in monolayer FeSe enhanced by quantum geometry
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