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Recent STM experiments and theoretical considerations have highlighted therole of interaction-driven orbital selectivity in FeSe, and its role ingenerating the extremely anisotropic superconducting gap structure in thismaterial. We study the magnetic excitation spectrum resulting from the coherentquasiparticles within the same renormalized random phase approximation approachused to explain the STM experiments, and show that it agrees well with thelow-energy momentum and energy dependent response measured by inelastic neutronscattering experiments. We find a correlation-induced suppression of$(\pi,\pi)$ scattering due to a small quasiparticle weight of states of$d_{xy}$ character. We compare predictions for twinned and untwinned crystals,and predict in particular a strongly $(\pi,0)$-dominated response at lowenergies in untwinned systems, in contrast to previous itinerant theories.

Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity