期刊
PHYSICAL REVIEW B
卷 90, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.075121
关键词
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资金
- National Key Basic Research Program of China [2013CB328702]
- DOE [DE-NA0001842-0]
- Office of the President of the University of California
- CNPq
- FAPERJ
Determinant quantum Monte Carlo (DQMC) is used 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 2 x 2 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 approximate to 0.4 at which the pairing vertex is most attractive. The 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.
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