Correlated starting points for the functional renormalization group

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

Результат исследований: Вклад в журналСтатьярецензирование

33 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаАнглийский
Номер статьи045120
ЖурналPhysical Review B - Condensed Matter and Materials Physics
Том91
Номер выпуска4
DOI
СостояниеОпубликовано - 16 янв. 2015
Опубликовано для внешнего пользованияДа

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