Efficient Fermionic One-Loop RG for the 2D Hubbard Model at Van Hove Filling

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We propose a novel 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. Besides being more efficient than previous N-patch schemes, this parametrization also reduces the ambiguity of introducing boson fields. We apply this parametrization to the two-dimensional (t,t')-Hubbard model using a novel $Ω$-frequency regularization.
4 pages, 2 figures

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/219275

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0902.1651
 http://arxiv.org/abs/0902.1651

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arXiv