[Zurück]

M.W. Haverkort, G. Sangiovanni, P. Hansmann, A. Toschi, Y. Lu, S. Macke:
"Bands, resonances, edge singularities and excitons in core level spectroscopy investigated within the dynamical mean-field theory";
EPL (Europhysics Letters), 108 (2014), 5.

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.

http://dx.doi.org/10.1209/0295-5075/108/57004