Phase Fluctuations and Single Fermion Spectral Density in 2D Systems with Attraction
Abstract
The effect of static fluctuations in the phase of the order parameter on the normal and superconducting properties of a 2D system with attractive four-fermion interaction has been studied. Analytic expressions for the fermion Green function, its spectral density and the density of states are derived. The resultant single-particle Green function clearly demonstrates non-Fermi liquid behavior. The results show that as the temperature increases through the 2D critical temperature the width of the quasiparticle peaks broadens significantly. At the same time one retains the gap in quasiparticle spectrum. Thus one can in principle explain the pseudogap behavior observed in high-T_c superconductors since we expect the dynamical fluctuations to lead to a filling of this gap.Keywords
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