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- W2101817811 abstract "We present a controlled perturbative approach to the low-temperature phase diagram of highly inhomogeneous Hubbard models in the limit of small coupling, ${t}^{ensuremath{'}}$, between clusters. We apply this to the dimerized and checkerboard models. The dimerized model is found to behave like a doped semiconductor, with a Fermi-liquid groundstate with parameters (e.g., the effective mass) which are smooth functions of the Hubbard interaction, $U$. By contrast, the checkerboard model has a Fermi liquid phase at large $U>{U}_{c}=4.58$, a $d$-wave superconducting state with a full gap for ${U}_{c}>U>0$, and a narrow strip of an intermediate $d$-wave superconducting phase with gapless ``nodal'' quasiparticles for $ensuremath{mid}Uensuremath{-}{U}_{c}ensuremath{mid}<mathcal{O}({t}^{ensuremath{'}})$." @default.
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- W2101817811 date "2006-06-09" @default.
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- W2101817811 title "Superconductivity in inhomogeneous Hubbard models" @default.
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- W2101817811 doi "https://doi.org/10.1103/physrevb.73.214510" @default.
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