Resonant inelastic x-ray scattering study of charge excitations in La2CuO4

Abstract

We report a resonant inelastic x-ray scattering study of the dispersion relations of charge transfer excitations in insulating La${}_2$CuO${}_4$. These data reveal two peaks, both of which show two-dimensional characteristics. The lowest energy excitation has a gap energy of $\sim 2.2$ eV at the zone center, and a dispersion of $\sim 1$ eV. The spectral weight of this mode becomes dramatically smaller around ($\pi$, $\pi$). The second peak shows a smaller dispersion ($\sim 0.5$ eV) with a zone-center energy of $\sim 3.9$ eV. We argue that these are both highly dispersive exciton modes damped by the presence of the electron-hole continuum.

5 pages, 3 figures

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• Momentum-Resolved Charge Excitations in a Prototype One Dimensional Mott Insulator
• Evidence of phonon mediated coupling between charge transfer and ligand field excitons in Sr${}_2$CuO${}_2$Cl${}_2$

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