Hubbard model versus t-J model: The one-particle spectrum

Abstract

The origin of the apparent discrepancies between the one-particle spectra of the Hubbard and t-J models is revealed: Wavefunction corrections, in addition to the three-site terms, should supplement the bare t-J. In this way a quantitative agreement between the two models is obtained, even for the intermediate-$U$ values appropriate for the high-Tc cuprate superconductors. Numerical results for clusters of up to 20 sites are presented. The momentum dependence of the observed intensities in the photoemission spectra of Sr2CuO2Cl2 are well described by this complete strong-coupling approach.

4 two-column RevTeX pages, including 4 Postscript figures. Uses epsf. Accepted for publication in Physical Review B, Rapid Communication

References in corpus (6)

• Correlated Electrons in High Temperature Superconductors
• Theory of Underdoped Cuprates
• Quasiparticle Dispersion of the 2D Hubbard Model: From an Insulator to a Metal
• Photoemission spectra of $\mathrm{S}{\mathrm{r}}_2\mathrm{Cu}{\mathrm{O}}_2\mathrm{C}{\mathrm{l}}_2$: a theoretical analysis
• Validity of the rigid band picture for the t-J model
• Inverse photoemission in strongly correlated electron systems

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