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.

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

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• Evidence for d-wave superconductivity in single layer FeSe/SrTiO3 probed by quasiparticle scattering off step edges
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Quantum geometric effect on Fulde-Ferrell-Larkin-Ovchinnikov superconductivity
• Superconductivity in monolayer FeSe enhanced by quantum geometry
• Emergent vortex Majorana zero mode in iron-based superconductors
• Topological Superconductivity from Unconventional Band Degeneracy with Conventional Pairing
• Superconductivity of anomalous pseudospin
• General theory of robustness against disorder in multi-band superconductors
• Distortional weak-coupling instability of Bogoliubov Fermi surfaces
• Theory of the low- and high-field superconducting phases of UTe${}_2$
• Tomonaga Luttinger liquid in the topological edge channel of multilayer FeSe
• Nematic Bogoliubov Fermi surfaces from magnetic toroidal order in FeSe${}_{1-x}$S${}_x$
• Searching for Majorana quasiparticles at vortex cores in iron-based superconductors
• Pair-breaking in superconductors with strong spin-orbit coupling
• Stability of Bogoliubov Fermi Surfaces within BCS Theory
• Anisotropic gap structure and sign reversal symmetry in monolayer Fe(Se,Te)
• Supercurrent-induced Anomalous Thermal Hall Effect as a New Probe to Superconducting Gap Anisotropy
• Diversified Ruderman-Kittel-Kasuya-Yosida Interactions in a Nonsymmorphic Crystal
• Spin correlations in the parent phase of Li${}_{1-x}$Fe${}_x$ODFeSe
• Inversion-symmetric Electron Gases as New Platforms for Topological Planar Josephson Junctions
• Symmetry-protected gates of Majorana qubits in a high-$T_c$ superconductor platform