Failure of Fermi-Liquid Theory at Strong Coupling

Details Failure of Fermi-Liquid Theory at Strong Coupling Failure of Fermi-Liquid Theory at Strong Coupling

1995-12-08

arxiv.org/abs/cond-mat/9512063v1

Physics

Condensed Matter

10 pages, using RevTeX, no figures

Scientific paper

We investigate quantitatively the effects of strong electron-electron coupling onto the dynamics of lattice electrons. To that purpose the self-consistent version of the bubble-chain approximation at zero temperature and half filling of the Anderson (Hubbard) model is used. Special attention is paid to a critical region of an electron-hole correlation function shaping the transition from weak to strong interaction. We find an analytic solution with Fermi-liquid properties on the weak-coupling side of the critical region around the two-particle pole. It is shown that Fermi-liquid theory does not lead to a consistent behavior of the self-consistent solution on the strong-coupling side of the critical region.

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