Overscreening in Hubbard electron systems
H. -B. Schüttler, C. Gröber, H. G. Evertz, W. Hanke
Abstract
We show that doping-induced charge fluctuations in strongly correlated Hubbard electron systems near the 1/2-filled, insulating limit cause overscreening of the electron-electron Coulomb repulsion. The resulting attractive screened interaction potential supports dx2-y2-pairing with a strongly peaked, doping dependent pairing strength at lower doping, followed by s-wave pairing at larger doping levels.
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