Mapping the unoccupied state dispersions in Ta${}_2$NiSe${}_5$ with resonant inelastic x-ray scattering

C. Monney, M. Herzog, A. Pulkkinen +8

The transition metal chalcogenide Ta${}_2$NiSe${}_5$ undergoes a second-order phase transition at $T_c=328$ K involving a small lattice distortion. Below $T_c$, a band gap at the cente…