Cumulant expansion of the retarded one-electron Green function

The cumulant expansion is a powerful approach for including correlation effects in electronic structure calculations beyond the GW approximation. However, the expansion is not generally valid, as current implementations ignore terms that mix particle and hole states and lead to partial occupation nu...

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Veröffentlicht in:	Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-08, Vol.90 (8), Article 085112
Hauptverfasser:	Kas, J. J., Rehr, J. J., Reining, L.
Format:	Artikel
Sprache:	eng
Schlagworte:	Approximation Condensed Matter Correlation Electronic structure Green's functions Mathematical analysis Occupation Physics Spectra
Online-Zugang:	Volltext
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