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Determinant quantum Monte Carlo study of <math><mi>d</mi></math> -wave pairing in the plaquette Hubbard hamiltonian [electronic resource].

Published:
Washington, D.C. : United States. National Nuclear Security Administration, 2014.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
Article numbers 075,121 : digital, PDF file
Additional Creators:
United States. National Nuclear Security Administration and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
We used the determinant Quantum Monte Carlo (DQMC) to determine the pairing and magnetic response for a Hubbard model built up from four-site clusters - a two-dimensional square lattice consisting of elemental 2x2 plaquettes with hopping t and on-site repulsion U coupled by an interplaquette hopping t' ≤ t. Superconductivity in this geometry has previously been studied by a variety of analytic and numeric methods, with differing conclusions concerning whether the pairing correlations and transition temperature are raised near half-filling by the inhomogeneous hopping or not. For U/t = 4, DQMC indicates an optimal t'/t ≈ 0.4 at which the pairing vertex is most attractive. We also found that optimal t'/t increases with U/t. We then contrast our results for this plaquette model with a Hamiltonian which instead involves a regular pattern of site energies whose large site energy limit is the three band CuO2 model; we show that there the inhomogeneity rapidly, and monotonically, suppresses pairing.
Report Numbers:
E 1.99:1344108
Subject(s):
Note:
Published through SciTech Connect.
08/13/2014.
Physical Review. B, Condensed Matter and Materials Physics 90 7 ISSN 1098-0121; PRBMDO AM
T. Ying; R. Mondaini; X. D. Sun; T. Paiva; R. M. Fye; R. T. Scalettar.
Univ. of California, Davis, CA (United States)
Funding Information:
NA0001842
View MARC record | catkey: 23758843