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Title: Correlated starting points for the functional renormalization group
Authors: Wentzell, N.
Taranto, C.
Katanin, A.
Toschi, A.
Andergassen, S.
Issue Date: 2015
Publisher: American Physical Society
Citation: Correlated starting points for the functional renormalization group / N. Wentzell, C. Taranto, A. Katanin, et al. — DOI 10.1103/PhysRevB.91.045120 // Physical Review B - Condensed Matter and Materials Physics. — 2015. — Vol. 91. — Iss. 4. — 045120.
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. © 2015 American Physical Society.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84921044727
PURE ID: 380845
ISSN: 10980121
DOI: 10.1103/PhysRevB.91.045120
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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