Correlated starting points for the functional renormalization group

N. Wentzell, C. Taranto, A. Katanin, A. Toschi, S. Andergassen

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

We present a general frame to extend functional renormalization group (fRG) based computational schemes by using an exactly solvable interacting reference problem as starting point for the RG flow. The systematic expansion around this solution accounts for a nonperturbative inclusion of correlations. Introducing auxiliary fermionic fields by means of a Hubbard-Stratonovich transformation, we derive the flow equations for the auxiliary fields and determine the relation to the conventional weak-coupling truncation of the hierarchy of flow equations. As a specific example we consider the dynamical mean field theory (DMFT) solution as reference system, and discuss the relation to the recently introduced DMF2RG and the dual-fermion formalism.

Original languageEnglish
Article number045120
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number4
DOIs
Publication statusPublished - 16 Jan 2015
Externally publishedYes

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