Two-particle Cluster Perturbation Theory, built from a frequency-independent vertex approximation, reproduces the spin susceptibility of the 1D Hubbard model qualitatively at half filling, with quantitative deviations away from half filling.
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Two-particle Correlation Functions in Cluster Perturbation Theory: Hubbard Spin Susceptibilities
Two-particle Cluster Perturbation Theory, built from a frequency-independent vertex approximation, reproduces the spin susceptibility of the 1D Hubbard model qualitatively at half filling, with quantitative deviations away from half filling.