Sect. Crystallography

The insulating mixed-valent compound hosts two holes per trimer unit. We address the electronic structure via resonant inelastic x-ray scattering (RIXS) at the Ir edge and exact diagonalization. The holes occupy quasimolecular orbitals that are delocalized over a trimer. This gives rise to a rich intra- excitation spectrum that extends from 0.5 eV to energies larger than 2 eV. Furthermore, it yields a strong modulation of the RIXS intensity as a function of the transferred momentum q.

Topics Exchange interactions, Quasiparticle, Ultrafast X-rays, Hard X-rays, Crystal lattices, Photoexcitations, Resonant inelastic X-ray scattering The control of quantum phases is a focal point of modern condensed matter physics research. Through chemical doping, electric and magnetic fields, or external pressure, critical points can be surpassed, leading to the formation of new phases of matter.