One-Particle Excitation of the Two-Dimensional Hubbard Model
Strongly Correlated Electrons
2009-10-30 v1 Superconductivity
Abstract
The real part of the self-energy of interacting two-dimensional electrons has been calculated in the t-matrix approximation. It is shown that the forward scattering results in an anomalous term leading to the vanishing renormalization factor of the one-particle Green function, which is a non-perturbative effect of the interaction U. The present result is a microscopic demonstration of the claim by Anderson based on the conventional many-body theory. The effect of the damping of the interacting electrons, which has been ignored in reaching above conclusion, has been briefly discussed.
Keywords
Cite
@article{arxiv.cond-mat/9702200,
title = {One-Particle Excitation of the Two-Dimensional Hubbard Model},
author = {Ken Yokoyama and Hidetoshi Fukuyama},
journal= {arXiv preprint arXiv:cond-mat/9702200},
year = {2009}
}
Comments
7 pages, LaTeX, 1 figure, uses jpsj.sty, to be published in J. Phys. Soc. Jpn. 66 No. 3 (1997)