Incident-energy-dependent spectral weight of resonant inelastic x-ray scattering in doped cuprates

Abstract

We theoretically investigate the incident-photon energy omega_i dependence of resonant inelastic x-ray scattering (RIXS) tuned for the Cu L edge in cuprate superconductors by using the exact diagonalization technique for a single-band Hubbard model. Depending on the value of core-hole Coulomb interaction in the intermediate state, RIXS for non-spin-flip channel shows either a omega_i-dependent fluorescencelike or omega_i-independent Raman-like behavior for hole doping. An analysis of x-ray absorption suggests that the core-hole Coulomb interaction is larger than on-site Coulomb interaction in the Hubbard model, resulting in a fluorescencelike behavior in RIXS consistent with recent RIXS experiments. A shift on the high-energy side of the center of spectral distribution is also predicted for electron-doped systems though spectral weight is small. Main structures in spin-flip channel exhibit a Raman-like behavior as expected, accompanied with a fluorescencelike behavior with small intensity.

8 pages, 6 figures

References in corpus (3)

• Insights into the High Temperature Superconducting Cuprates from Resonant Inelastic X-ray Scattering
• Using RIXS to uncover elementary charge and spin excitations in correlated materials
• Raman and fluorescence characteristics of resonant inelastic X-ray scattering from doped superconducting cuprates

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