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

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dc.creatorPutz, R.
dc.creatorPreuss, R.
dc.creatorMuramatsu, A.
dc.creatorHanke, W.
dc.date1994-10-12
dc.date1994-10-24
dc.date.accessioned2026-07-07T08:58:51Z
dc.date.available2026-07-07T08:58:51Z
dc.descriptionIt 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.
dc.descriptionREVtex, 10 pages, 4 figures (in uuencoded postscript format) appended at the end of the file
dc.identifierhttps://arxiv.org/abs/cond-mat/9410039
dc.identifierhttp://arxiv.org/abs/cond-mat/9410039
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/147490
dc.subjectCondensed Matter
dc.titleConserving approximation for the three-band Hubbard model: flat quasiparticle dispersion
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