Effective pairing interaction in a system with an incipient band

Abstract

The nature and mechanism of superconductivity in the extremely electron-doped FeSe based superconductors continues to be a matter of debate. In these systems, the hole-like band has moved below the Fermi energy, and various spin-fluctuation theories involving pairing between states near the electron Fermi surface and states of this incipient band have been proposed. Here, using a dynamic cluster quantum Monte Carlo calculation for a bilayer Hubbard model we show that the pairing in these systems can be understood in terms of an effective retarded attractive interaction between electrons near the electron Fermi surface.

5 pages, 5 figures

References in corpus (3)

• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Continuous-time auxiliary field Monte Carlo for quantum impurity models
• Sub-matrix updates for the Continuous-Time Auxiliary Field algorithm

Cited by in corpus (5)

• Trends in electronic structures and $s_{\pm }$-wave pairing for the rare-earth series in bilayer nickelate superconductor $R_3$Ni${}_2$O${}_7$
• Quantum geometric effect on Fulde-Ferrell-Larkin-Ovchinnikov superconductivity
• Enhanced superconductivity in FeSe/SrTiO${}_3$ from the combination of forward scattering phonons and spin fluctuations
• Hidden Ladder in SrMoO${}_3$/SrTiO${}_3$ Superlattices: Experiments and Theoretical Calculations
• Superconductivity in the bilayer Hubbard model: Are two Fermi surfaces better than one?