Revisiting the origin of satellites in core level photoemission of transparent conducting oxides: the case of $n$-doped SnO${}_2$

Abstract

The longstanding problem of interpretation of satellite structures in core level photoemission spectra of metallic systems with a low density of conduction electrons is addressed using the specific example of Sb-doped SnO${}_2$. Comparison of {\it ab initio} many-body calculations with experimental hard X-ray photoemission spectra of the Sn 4$d$ states shows that strong satellites are produced by coupling of the Sn core hole to the plasma oscillations of the free electrons introduced by doping. Within the same theoretical framework, spectral changes of the valence band spectra are also related to dynamical screening effects. These results demonstrate that, for the interpretation of electron correlation features in the core level photoelectron spectra of such narrow-band materials, going beyond the homogeneous electron gas electron-plasmon coupling model is essential.

arXiv comment6 PAGES, 4 FIGURES

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• Electron-plasmon and electron-phonon satellites in the angle-resolved photoelectron spectra of n-doped anatase TiO2
• Demonstration of resonant inelastic X-ray scattering as a probe of exciton-phonon coupling
• Thermally-Enhanced Fröhlich Coupling in SnSe
• Solid phase epitaxial growth of the correlated-electron transparent conducting oxide SrVO3