Functional renormalization group study of pairing symmetry and pairing mechanism in iron-selenide superconductors
Functional renormalization group study of pairing symmetry and pairing mechanism in iron-selenide superconductors
In iron selenide superconductors only electron-like Fermi pockets survive, challenging the $S^{\pm}$ pairing based on the quasi-nesting between the electron and hole Fermi pockets (as in iron arsenides). By functional renormalization group study we show that an in-phase $S$-wave pairing on the electron pockets ($S^{++}_{ee}$) is realized. The pairing mechanism …