Inelastic x-ray scattering from valence electrons near absorption edges of FeTe and TiSe₂

We study resonant inelastic x-ray scattering (RIXS) peaks corresponding to low-energy particle-hole excited states of metallic FeTe and semimetallic TiSe₂ for photon incident energy tuned near the L₃ absorption edge of Fe and Ti, respectively. We show that the cross-section amplitudes are well described within a renormalization-group theory where the effect of the core electrons is captured by effective dielectric functions expressed in terms of the the atomic scattering parameters f₁ of Fe and Ti. This method can be used to extract the dynamical structure factor from experimental RIXS spectra in metallic systems