Signatures of multiple charge excitations in RIXS spectra of metals

Abstract

We study how multiple charge excitations appear in the resonant inelastic x-ray scattering (RIXS) spectra of metals. The single excitations in the problem are the plasmons and electron-hole pairs, and multi-excitation processes are usually neglected. However, at small momentum transfer the multi-excitation contributions may dominate the signal and one needs to understand how to interpret the data. In particular, we demonstrate how to "decode" the total multi-excitation intensity and extract the plasmon dispersion. While our calculations are based on the random phase approximation, which does not allow to obtain quantitatively precise results in the entire region of parameters, we expect them to capture semi-qualitatively all features expected for charged Fermi-liquid states, including universal and singular properties of the RIXS spectra.

10 pages, 19 figures

References in corpus (9)

• Insights into the High Temperature Superconducting Cuprates from Resonant Inelastic X-ray Scattering
• Ultrashort Lifetime Expansion for Indirect Resonant Inelastic X-ray Scattering
• Unraveling the Nature of Charge Excitations in La${}_2$CuO${}_4$ with Momentum-Resolved Cu $K$-edge Resonant Inelastic X-ray Scattering
• Two-magnon excitations in resonant inelastic x-ray scattering from quantum Heisenberg antiferromagnets
• Cu $K$-edge Resonant Inelastic X-Ray Scattering in Edge-Sharing Cuprates
• Electronic Raman scattering in correlated materials: exact treatment of nonresonant, mixed, and resonant scattering with dynamical mean field theory
• Theory of two magnon Raman scattering in antiferromagnetic iron pnictides
• Momentum dependent light scattering in insulating cuprates
• Momentum-dependent light scattering in a 2D Heisenberg antiferromagnet

Cited by in corpus (1)

• Real-frequency response functions at finite temperature