Spectral Function of 2D Fermi Liquids
Strongly Correlated Electrons
2009-10-30 v2
Abstract
We show that the spectral function for single-particle excitations in a two-dimensional Fermi liquid has Lorentzian shape in the low energy limit. Landau quasi-particles have a uniquely defined spectral weight and a decay rate which is much smaller than the quasi-particle energy. By contrast, perturbation theory and the T-matrix approximation yield spurious deviations from Fermi liquid behavior, which are particularly pronounced for a linearized dispersion relation.
Cite
@article{arxiv.cond-mat/9706143,
title = {Spectral Function of 2D Fermi Liquids},
author = {Christoph J. Halboth and Walter Metzner},
journal= {arXiv preprint arXiv:cond-mat/9706143},
year = {2009}
}
Comments
6 pages, LaTeX2e, 5 EPS figures