Incommensurate nematic fluctuations in the two-dimensional Hubbard model

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

2012-03-13

arxiv.org/abs/1203.2887v2

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures; section 4 extended, figures improved, and appendix added

Scientific paper

We analyze effective d-wave interactions in the two-dimensional extended Hubbard model at weak coupling and small to moderate doping. The interactions are computed from a renormalization group flow. Attractive d-wave interactions are generated via antiferromagnetic spin fluctuations in the pairing and charge channels. Above Van Hove filling, the d-wave charge interaction is maximal at incommensurate diagonal wave vectors, corresponding to nematic fluctuations with a diagonal modulation. Below Van Hove filling a modulation along the crystal axes can be favored. The nematic fluctuations are enhanced by the nearest-neighbor interaction in the extended Hubbard model, but they always remain smaller than the dominant antiferromagnetic, pairing, or charge density wave fluctuations.

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