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Exciting core-level spectroscopy (1709.02288v1)
Published 7 Sep 2017 in cond-mat.mtrl-sci
Abstract: We delineate an ab initio approach for obtaining x-ray absorption spectra as provided by many-body perturbation theory, together with its realization within an all-electron framework. Employing the Bethe-Salpeter equation, we address excitations from different absorption edges in a broad range of material classes, analyzing exciton binding strengths and character. We also discuss when the supercell core-hole approach is likely to fail.
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