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Conserving approximation for the three-band Hubbard model: flat quasiparticle dispersion

R. Putz·R. Preuss·A. Muramatsu·W. Hanke
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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 $(π,0)$ and $(0,π)$ 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.

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R. Putz, R. Preuss, A. Muramatsu, W. Hanke. 1994-10-24. Conserving approximation for the three-band Hubbard model: flat quasiparticle dispersion. https://arxiv.org/abs/cond-mat/9410039

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