Efficient Parametrization of the Vertex Function, Ω–Scheme, and the (t, t′)–Hubbard Model at Van Hove Filling

Abstract

We propose a new parametrization of the four–point vertex function in the one–loop one–particle irreducible renormalization group (RG) scheme for fermions. It is based on a decomposition of the effective two–fermion interaction into fermion bilinears that interact via exchange bosons. The numerical computation of the RG flow of the boson propagators… (More)

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Cite this paper

@inproceedings{Husemann2009EfficientPO, title={Efficient Parametrization of the Vertex Function, Ω–Scheme, and the (t, t′)–Hubbard Model at Van Hove Filling}, author={Christoph Husemann}, year={2009} }