Incommensurate antiferromagnetic fluctuations in the two-dimensional Hubbard model

Details Incommensurate antiferromagnetic fluctuations in the two-dimensional Hubbard model Incommensurate antiferromagnetic fluctuations in the two-dimensional Hubbard model

2009-03-18

arxiv.org/abs/0903.3168v2

Phys. Rev. B 80 014436 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 8 figures, some changes due to referees' comments, equivalent to published version

Scientific paper

Commensurate and incommensurate antiferromagnetic fluctuations in the two-dimensional repulsive t-t'-Hubbard model are investigated using functional renormalization group equations. For a sufficient deviation from half filling we establish the existence of local incommensurate order below a pseudocritical temperature T_{pc}. Fluctuations not accounted for in the mean field approximation are important--they lower T_{pc} by a factor \approx2.5.

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