Fig. 4: Decoupling of the nematic and magnetic interactions and the Fermi surface of FeSe_1-xS_x.

a Schematic Fermi surface of FeSe_1-xS_x outside of the nematic phase showing the Γ-centered hole pocket (α) and X, Y-centered electron pockets (ε and δ) at k_z = 0. States on different pockets can be connected via finite-Q scattering as indicated by the gray arrows. b Schematic illustrating the distinct regions of quasiparticle dressing due to critical magnetic fluctuations (grey circles) arising from the translation of the pockets through Q = (π, 0), (0, π), and nematic (Pomeranchuk) fluctuations (lighter shaded regions on the electron/hole pockets where the quasiparticle spectral weight is reduced⁶³).