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Journal of Physics and Chemistry of Solids

Weakening of antiferromagnetic correlations by doping in the 2D Hubbard model

Bumsoo Kyung

Published Jan 1, 2000• 0 citations
Publisher
DOI
10.1016/s0022-3697(99)00233-4

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The superconducting phase of the 2D one-band Hubbard model is studied within the FLEX approximation and by using an Eliashberg theory. We investigate the doping dependence of T c , of the gap function Δ( k ,ω) and of the effective pairing interaction. Thus we find that T c becomes maximal for 13% doping. In overdoped systems T c decreases due to the weakening of the antiferromagnetic correlations, while in the underdoped systems due to the decreasing quasi-particle lifetimes. Furthermore, we find shadow states below T c which affect the electronic excitation spectrum and lead to fine structure in photoemission experiments.