Strongly correlated electrons: Dynamical vertex renormalization

Details Strongly correlated electrons: Dynamical vertex renormalization Strongly correlated electrons: Dynamical vertex renormalization

1998-10-15

arxiv.org/abs/cond-mat/9810175v1

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 4 EPS figures; International Workshop on Electron Correlations and Materials Properties, Crete, Greece, June 28 - Ju

Scientific paper

Single-band Hubbard model at criticality of the metal-insulator transition is studied using approximations derived from parquet theory. It is argued that only the electron-hole and interaction two-particle channels in the parquet algebra are relevant. A scheme is proposed how to reduce the parquet equations to a manageable form the complexity of which is comparable with single-channel approximations such as the renormalized RPA. The newly derived approximation, however, contains dynamical vertex corrections, remains self-consistent at the two-particle level and allows only for integrable singularities. A qualitatively new approach for studying two-particle singularities at zero temperature is obtained.

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