Pseudogap effects induced by resonant pair scattering

TL;DR

This paper shows how resonant pair scattering in correlated electrons can induce pseudogap phenomena above T_c, with implications for understanding cuprate superconductors and their experimental signatures.

Contribution

It introduces a simple fermionic model demonstrating pseudogap formation via resonant pair scattering, contrasting with other theoretical approaches.

Findings

Resonant pair scattering causes spectral peak splitting.

Pseudogap appears for intermediate superconducting interactions.

Implications discussed for photoemission and tunneling in cuprates.

Abstract

We demonstrate how resonant pair scattering of correlated electrons above T_c 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.