Resonant Inelastic x-ray scattering
RIXS is a photon-in, photon-out energy loss spectroscopy based on the resonant absorption and re-emission of photons. During the RIXS process, incident photons excite a core electron into the valence band, creating an intermediate excited state with a hole in a core level. The resulting core-hole potential creates many excitations in the system before the core hole decays, emitting a photon and leaving the system in an excited final state. The generated excitations encode information about the elementary excitations of the solid. RIXS is rapidly advancing as a powerful probe capable of accessing charge, orbital, spin, and lattice excitations in a momentum-resolved way. These capabilities make RIXS an ideal probe for systems with interacting and competing degrees of freedom.
Electron-lattice Interactions in RIXS
We have recently used RIXS to study spin, charge, and excitations in several quasi-1D edge-shared cuprates including Ca2+xY2-xCu5O10 (CYCO)  and Li2CuO2 (LCO) [3,4]. For example, the figure below shows results from one of our current collaborations studying lattice vibrations in the spin-chain system LCO, where we inferred a large renormalization of the charge transfer energy due to strong electron-phonon interactions in this material. These calculations utilized state-of-the-art exact diagonalization methods.
References and suggested papers
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