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

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.5133· OSTI ID:279075

Putz, R; Preuss, R; Muramatsu, A ^[1]; Hanke, W ^[2]

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1. Institut fuer Theoretische Physik, Universitaet Wuerzburg, Am Hubland, D-97074 Wuerzburg (Federal Republic of Germany)
2. Institute for Theoretical Physics, University of California, Santa Barbara, California 93106 (United States)

It is shown that the low-energy single-particle spectrum of the three-band Hubbard model at finite hole dopings agrees remarkably well with quantum Monte Carlo and experimental data within the framework of a conserving approximation including self-consistently the interaction with charge, spin, and particle-particle fluctuations. The dispersion of the quasiparticle peak is flat around the ({pi},0), (0,{pi}) points as observed in recent angle-resolved photoemission measurements. The significant reduction of the dispersion near the Fermi level is due to spin fluctuations, rather than being induced by band effects. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 279075
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 53; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BAND THEORY
CHARGE-EXCHANGE INTERACTIONS
CUPRATES
ELECTRIC CONDUCTIVITY
ELECTRONIC STRUCTURE
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
MAGNETIC PROPERTIES
PARTICLE-HOLE MODEL
SELF-ENERGY