Two-dimensional negative- U Hubbard model

Journal Article · Sun Feb 17 23:00:00 EST 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.946· OSTI ID:5863006

Moreo, A; Scalapino, D J ^[1]

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1. Department of Physics, University of California, Santa Barbara, California 93106 (US)

Quantum Monte Carlo simulations are used to explore the phase diagram of the negative-{ital U} Hubbard model. As the system is doped away from half filling, {l angle}{ital n}{r angle}=1, the {ital s}-wave pair-field correlations are enhanced and the charge-density-wave correlations suppressed. There is no indication of phase separation. Away from half filling, the pair-field correlations are consistent with Kosterlitz-Thouless scaling and a finite {ital T}{sub {ital c}} which peaks near {l angle}{ital n}{r angle}=1 but vanishes at exactly half filling.

• DOE Contract Number: FG03-85ER45197
• OSTI ID: 5863006
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:7; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
DATA
DIAGRAMS
EXCHANGE INTERACTIONS
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
INFORMATION
INTERACTIONS
MAGNETISM
MAGNETIZATION
MONTE CARLO METHOD
NUMERICAL DATA
PARTIAL WAVES
PHASE DIAGRAMS
PHYSICAL PROPERTIES
S WAVES
SCALING LAWS
SIMULATION
SOLIDS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THEORETICAL DATA
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TWO-DIMENSIONAL CALCULATIONS
VARIATIONS