Functional Renormalization Group calculation of the Fermi surface of a spin-ladder

Details Functional Renormalization Group calculation of the Fermi surface of a spin-ladder Functional Renormalization Group calculation of the Fermi surface of a spin-ladder

2007-02-19

arxiv.org/abs/cond-mat/0702440v1

PRB 75 (30/03/2007) 094516

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.75.094516

We study non conventional superconductivity on a ladder, improving the predictions of the Hubbard model. The determination of the Fermi surface, in 2 or 3 dimensions, remains a very hard task, but it is exactly solvable for a single ladder. We use functional Renormalisation Group methods, which prove, here, scheme-dependant. In the superconducting phase, the binding/antibinding gap is stabilized, but in the antiferromagnetic phase, it shrinks and the ladder turns one-dimensional.

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