NON-FERMI-LIQUID BEHAVIOR IN THE FLUCTUATING GAP MODEL: FROM THE POLE TO A ZERO OF THE GREEN'S FUNCTION
Kuchinskii E.Z., Sadovskii M.V.

Received: February 17, 2006

PACS: 71.10.Hf, 71.27.+a, 74.72.-h

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We analyze the non-Fermi-liquid (NFL) behavior of the fluctuating gap model (FGM) of pseudogap behavior in both one and two dimensions. A detailed discussion of the quasiparticle renormalization (Z-factor) is given, demonstrating a kind of ``marginal'' Fermi-liquid or Luttinger-liquid behavior and topological stability of the ``bare'' Fermi surface (the Luttinger theorem). In the two-dimensional case, we discuss the effective picture of the Fermi surface ``destruction'' both in ``hot spot'' model of dielectric (AFM, CDW) pseudogap fluctuations and for the qualitatively different case of superconducting d-wave fluctuations, reflecting the NFL spectral density behavior and similar to that observed in ARPES experiments on copper oxides.