Details

Autor(en) / Beteiligte

• Stepanov, E. A.
• Harkov, V.
• Lichtenstein, A. I.

Titel

Consistent partial bosonization of the extended Hubbard model

Ist Teil von

• Physical review. B, 2019-11, Vol.100 (20), p.1, Article 205115

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2019

Link zum Volltext

Quelle

APS: American Physical Society E-Journals (Physics)

Beschreibungen/Notizen

• We design an efficient and balanced approach that captures major effects of collective electronic fluctuations in strongly correlated fermionic systems using a simple diagrammatic expansion on a basis of dynamical mean-field theory. For this aim we perform a partial bosonization of collective fermionic fluctuations in leading channels of instability. We show that a simultaneous account for different bosonic channels can be done in a consistent way that allows to avoid the famous Fierz ambiguity problem. The present method significantly improves a description of an effective screened interaction W in both charge and spin channels, and has a great potential for application to realistic GW-like calculations for magnetic materials.