Journal
PHYSICAL REVIEW B
Volume 66, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.66.165105
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The solution of the Bethe-Salpeter equation (BSE) for the electron-hole two-particle Green's function has proven to yield optical absorption spectra of semiconductors and insulators beyond the independent quasiparticle approximation. The inclusion of electron-hole correlations greatly improves the accordance with experimental data. In this work we present an implementation of the BSE scheme into the linearized augmented plane-wave method, and apply our method to the semiconductor Si and to the wide band-gap insulator LiF. We discuss the effects of the electron-hole correlations and compare our results to the experimental data as well as to the previous theoretical findings.
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