Incommensurate nematic fluctuations in two-dimensional metals

Tobias Holder*, Walter Metzner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


To assess the strength of nematic fluctuations with a finite wave vector in a two-dimensional metal, we compute the static d-wave polarization function for tight-binding electrons on a square lattice. At Van Hove filling and zero temperature the function diverges logarithmically at q=0. Away from Van Hove filling the ground-state polarization function exhibits finite peaks at finite wave vectors. A nematic instability driven by a sufficiently strong attraction in the d-wave charge channel thus leads naturally to a spatially modulated nematic state, with a modulation vector that increases in length with the distance from Van Hove filling. Above Van Hove filling, for a Fermi surface crossing the magnetic Brillouin zone boundary, the modulation vector connects antiferromagnetic hot spots with collinear Fermi velocities.

Original languageEnglish
Article number165130
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number16
StatePublished - 20 Apr 2012
Externally publishedYes


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