One-electron spectral weight of the doped two-dimensional Hubbard model

Journal Article · Mon Jan 31 04:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.705· OSTI ID:5143059

Bulut, N; Scalapino, D J; White, S R ^[1]

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1. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080 (United States) Department of Physics, University of California-Santa Barbara, Santa Barbara, California 93106-9530 (United States) Department of Physics, University of California, Irvine, California 92717-4575 (United States)

We have calculated the single-particle density of states [ital N]([omega]) and the spectral weight [ital A]([bold p],[omega]) for the doped two-dimensional Hubbard model by combining quantum Monte Carlo simulations with the maximum-entropy analytic continuation technique. We present results for various values of the doping, temperature, and Coulomb repulsion [ital U]. For sufficiently strong Coulomb repulsions and near half filling, a Mott-Hubbard pseudogap exists. In this case, we find that a peak develops at the top of the lower Hubbard band near the Fermi level at temperatures of order of the hopping [ital t]. The structure of this peak is similar to that seen in the infinite dimensional Hubbard model.

• DOE Contract Number: FG03-85ER45197
• OSTI ID: 5143059
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:5; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALCULATION METHODS
CORRELATED-PARTICLE MODELS
COULOMB FIELD
DOPED MATERIALS
ELECTRIC FIELDS
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
FUNCTIONS
MATERIALS
MATHEMATICAL MODELS
MONTE CARLO METHOD
PARTICLE MODELS
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
TEMPERATURE DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS