Incommensurate nematic fluctuations in the two-dimensional Hubbard model

Husemann, C.; Metzner, W.

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Incommensurate nematic fluctuations in the two-dimensional Hubbard model

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Metzner, W.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Husemann, C., & Metzner, W. (2012). Incommensurate nematic fluctuations in the two-dimensional Hubbard model. Physical Review B, 86(8): 085113.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C341-C

Abstract

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.