Fermi Liquid Properties of a Two Dimensional Electron System With the Fermi Level Near a van Hove Singularity

Details Fermi Liquid Properties of a Two Dimensional Electron System With the Fermi Level Near a van Hove Singularity Fermi Liquid Properties of a Two Dimensional Electron System With the Fermi Level Near a van Hove Singularity

1999-05-27

arxiv.org/abs/cond-mat/9905399v1

Phys. Rev. B, Vol. 59, 13592 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 postscript figures

Scientific paper

10.1103/PhysRevB.59.13592

We use a diagrammatic approach to study low energy physics of a two dimensional electron system where the Fermi level is near van-Hove singularies in the energy spectrum. We find that in most regions of the $\epsilon_F-T$ phase diagram the system behaves as a normal Fermi liquid rather than a marginal Fermi liquid. Particularly, the imaginary part of the self energy is much smaller than the excitation energy, which implies well defined quasiparticle excitations, and single particle properties are only weakly affected by the presence of the van-Hove singularities. The relevance to high temperature superconductivity is also discussed.

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