Bosonic effective action for interacting fermions
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Institut fuer Theoretische Physik, Philosophenweg 16, 69120 Heidelberg (Germany)
We compare different versions of a bosonic description for systems of interacting fermions, with particular emphasis on the free-energy functional. The bosonic effective action makes the issue of symmetries particularly transparent. A systematic expansion for the bosonic effective action starts with a solution to the lowest-order Schwinger-Dyson or gap equation. We propose a two-particle irreducible formulation of an exact functional renormalization group equation for computations beyond leading order. On this basis we suggest a renormalized gap equation. This approach is compared with functional renormalization in a partially bosonized setting.
- OSTI ID:
- 20976708
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 8 Vol. 75; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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