Die u:cris Detailansicht:
Correlated starting points for the functional renormalization group
- Autor(en)
- N. Wentzell, C. Taranto, A. Katanin, A. Toschi, S. Andergassen
- Abstrakt
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 DMF(2)RG and the dual-fermion formalism.
- Organisation(en)
- Quantenoptik, Quantennanophysik und Quanteninformation
- Externe Organisation(en)
- Technische Universität Wien, Ural Federal University, Russian Academy of Sciences, Eberhard Karls Universität Tübingen
- Journal
- Physical Review B
- Band
- 91
- Anzahl der Seiten
- 11
- ISSN
- 1098-0121
- DOI
- https://doi.org/10.1103/PhysRevB.91.045120
- Publikationsdatum
- 01-2015
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103019 Mathematische Physik, 103009 Festkörperphysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/ae19cee4-4399-4a6b-a850-c8f03d9f0b98