Conserving approximation for the three-band Hubbard model: flat quasiparticle dispersion
Abstract
It is shown that the low-energy single-particle excitation-spectrum of the three-band Hubbard model at hole-dopings away from half-filling agrees remarkably well with Quantum Monte Carlo data and spectroscopic experiments within the framework of a conserving approximation that includes self-consistently the interaction with charge, spin, and two-particle fluctuations. The dispersion of the quasiparticle-peak obtained from the spectral-weight function is flat around the and points as has been observed in recent angle-resolved photoemission measurement. The significant reduction of the quasiparticle-dispersion near the Fermi-energy is due to spin-fluctuations, rather than being induced by band effects.
Cite
@article{arxiv.cond-mat/9410039,
title = {Conserving approximation for the three-band Hubbard model: flat quasiparticle dispersion},
author = {R. Putz and R. Preuss and A. Muramatsu and W. Hanke},
journal= {arXiv preprint arXiv:cond-mat/9410039},
year = {2008}
}
Comments
REVtex, 10 pages, 4 figures (in uuencoded postscript format) appended at the end of the file