paper

Theory of electron-phonon interactions in extended correlated systems probed by resonant inelastic x-ray scattering

arXiv:2412.12995 · doi:10.1103/PhysRevX.15.021030

Abstract

An emerging application of resonant inelastic x-ray scattering (RIXS) is the study of lattice excitations and electron-phonon (-ph) interactions in quantum materials. Despite the growing importance of this area of research, the community lacks a complete understanding of how the RIXS process excites the lattice and how these excitations encode information about the -ph interactions. Here, we present a detailed study of the RIXS spectra of the Hubbard-Holstein model defined on extended one-dimensional lattices. Using the density matrix renormalization group (DMRG) method, we compute the RIXS response while treating the electron mobility, many-body interactions, and core-hole interactions on an equal footing. The predicted spectra exhibit notable differences from those obtained using the commonly adopted Lang-Firsov models, with important implications for analyzing past and future experiments. Our results provide a deeper understanding of how RIXS probes -ph interactions and set the stage for a more realistic analysis of future experiments.

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