Quantum Monte Carlo study of pairing correlations in two-dimensional extended one-band and three-band Hubbard models

Using the recently developed constrained-path Monte Carlo method, we have completed a series of ground state computations of pairing correlation functions in two-dimensional extended one-band and three-band Hubbard models. We found that d x 2− y 2 -wave pairing correlations dominated s-wave correlat...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2001-11, Vol.364, p.134-137
Main Authors: Gubernatis, J.E., Guerrero, M., Lin, H.Q., Huang, Z.B.
Format: Article
Language:English
Subjects:
Hubbard models
Quantum Monte Carlo
Superconductivity
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Summary:Using the recently developed constrained-path Monte Carlo method, we have completed a series of ground state computations of pairing correlation functions in two-dimensional extended one-band and three-band Hubbard models. We found that d x 2− y 2 -wave pairing correlations dominated s-wave correlations but that these correlations were suppressed by increasing the strength of the Hubbard repulsion U and the lattice size and that this picture was not significantly altered by adding a next nearest neighbor hopping t ′ and a nearest neighbor Coulomb attraction V to the one band model or by adding a nearest-neighbor O–O hopping and Cu–O repulsion to the three-band model. The trends suggest an unlikeliness that these models superconduct.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(01)00731-6