One-Particle Excitation of the Two-Dimensional Hubbard Model

Details One-Particle Excitation of the Two-Dimensional Hubbard Model One-Particle Excitation of the Two-Dimensional Hubbard Model

1997-02-21

arxiv.org/abs/cond-mat/9702200v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, LaTeX, 1 figure, uses jpsj.sty, to be published in J. Phys. Soc. Jpn. 66 No. 3 (1997)

Scientific paper

10.1143/JPSJ.66.529

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.

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