Spectral Function and Self-Energy of the One-Dimensional Hubbard Model in the U --> infinity Limit

Details Spectral Function and Self-Energy of the One-Dimensional Hubbard Model in the U --> infinity Limit Spectral Function and Self-Energy of the One-Dimensional Hubbard Model in the U --> infinity Limit

1997-02-27

arxiv.org/abs/cond-mat/9702237v1

Z. Phys. B 103, 201 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

Latex, 3 pages, 2 figures, to appear in Z. Phys. B, Proceedings of the Euroconfernce on "Correlations in Unconventional Quantu

Scientific paper

10.1007/s002570050359

The interpretation of the k dependent spectral functions of the one-dimensional, infinite U Hubbard model obtained by using the factorized wave-function of Ogata and Shiba is revisited. The well defined feature which appears in addition to low energy features typical of Luttinger liquids, and which, close to the Fermi energy, can be interpreted as the shadow band resulting from $2k_F$ spin fluctuations, is further investigated. A calculation of the self-energy shows that, not too close to the Fermi energy, this feature corresponds to a band, i.e. to a solution of the Dyson equation $\omega - \epsilon(k) - Re \Sigma (k,\omega) =0$.

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