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Abstract:
Using a recently developed impurity solver we exemplify how dynamical
mean-field theory captures band excitations, resonances, edge
singularities and excitons in core level x-ray absorption spectroscopy
(XAS) and core level photo electron spectroscopy (cPES) on metals,
correlated metals and Mott insulators. Comparing XAS at different values
of the core-valence interaction shows how the quasiparticle peak in the
absence of core-valence interactions evolves into a resonance of similar
shape, but different origin. Whereas XAS is rather insensitive to the
metal insulator transition, cPES can be used, due to nonlocal screening,
to measure the amount of local charge fluctuation. Copyright (C) EPLA,
2014
