Particle-hole bound states in Mott-Hubbard insulators

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.7520· OSTI ID:6242020

Clarke, D G ^[1]

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1. Joseph Henry Laboratories of Physics, Princeton University, P.O. Box 708, Princeton, New Jersey 08544 (United States)

I present results that indicate the existence of strongly bound particle-hole excitations below the edge of the upper Hubbard band in a single-band, large-[ital U] Hubbard model in two dimensions, at half-filling. The appearance of these exciton states is due to correlation effects between a vacancy and a doubly occupied site induced by the antiferromagnetic background, in contrast to the conventional mechanism of exciton formation via long-range Coulomb attraction. I argue that in the insulating parent compounds of the high-temperature superconducting cuprates these correlation effects are of the same order of magnitude as particle-hole attraction due to longer-range Coulomb interactions.

• OSTI ID: 6242020
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:10; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665400* -- Quantum Physics Aspects of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOUND STATE
CRYSTAL MODELS
DIELECTRIC MATERIALS
EXCITONS
HIGH-TC SUPERCONDUCTORS
HOLES
HUBBARD MODEL
MATERIALS
MATHEMATICAL MODELS
PERTURBATION THEORY
QUASI PARTICLES
SUPERCONDUCTORS
TWO-DIMENSIONAL CALCULATIONS