Quasiparticle dispersion of the {ital t}-{ital J} and Hubbard models

Journal Article · Mon May 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.51.12045· OSTI ID:44567

Moreo, A; Haas, S; Sandvik, A W; Dagotto, E ^[1]

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1. Department of Physics and National High Magnetic Field Lab, Florida State University, Tallahassee, Florida 32306 (United States)

The spectral weight {ital A}(p,{omega}) of the two-dimensional {ital t}-{ital J} and Hubbard models has been calculated using exact diagonalization and quantum Monte Carlo techniques, at several densities 0.5{le}{l_angle}{ital n}{r_angle}{le}1.0. The photoemission ({omega}{lt}0) region contains two dominant distinct features, namely a low-energy quasiparticle peak with bandwidth of order {ital J}, and a broad valence band peak at energies of order {ital t}. This behavior {ital persists} away from half-filling, as long as the antiferromagnetic correlations are robust. The results give support to theories of the copper oxide materials based on the behavior of holes in antiferromagnets, and they also provide theoretical guidance for the interpretation of experimental photoemission data for the cuprates.

• OSTI ID: 44567
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANTIFERROMAGNETISM
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
MONTE CARLO METHOD
NUMERICAL SOLUTION
PHOTOEMISSION
QUASI PARTICLES
SPECTRAL FUNCTIONS
STATISTICAL MODELS