Possible spin excitation structure in monolayer FeSe grown on SrTiO${}_3$

Abstract

Based on recent high-resolution angle-resolved photoemission spectroscopy measurement in monolayer FeSe grown on SrTiO${}_3$, we constructed a tight-binding model and proposed a superconducting (SC) pairing function which can well fit the observed band structure and SC gap anisotropy. Then we investigated the spin excitation spectra in order to determine the possible sign structure of the SC order parameter. We found that a resonance-like spin excitation may occur if the SC order parameter changes sign along the Fermi surfaces. However, this resonance is located at different locations in momentum space compared to other FeSe-based superconductors, suggesting that the Fermi surface shape and pairing symmetry in monolayer FeSe grown on SrTiO${}_3$ may be different from other FeSe-based superconductors.

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Cited by in corpus (7)

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• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• Spin excitations in nickelate superconductors
• Spin excitations in the heavily overdoped monolayer graphene superconductor: an analog to the cuprates
• Spin excitations in bilayer La${}_3$Ni${}_2$O${}_7$ superconductors with the interlayer pairing
• In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands
• Dynamical Coulomb Blockade as a Signature of the Sign-Reversing Cooper Pairing Potential