Pseudogap effects induced by resonant pair scattering
Boldizsar Janko, Jiri Maly, K. Levin
Abstract
We demonstrate how resonant pair scattering of correlated electrons above Tc can give rise to pseudogap behavior. This resonance in the scattering T-matrix appears for superconducting interactions of intermediate strength, within the framework of a simple fermionic model. It is associated with a splitting of the single peak in the spectral function into a pair of peaks separated by an energy gap. Our physical picture is contrasted with that derived from other T-matrix schemes, with superconducting fluctuation effects, and with preformed pair (boson-fermion) models. Implications for photoemission and tunneling experiments in the cuprates are discussed.
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