Universality of Single-Particle Spectra of Cuprate Superconductors

Abstract

All the available data for the dispersion and linewidth of the single-particle spectra above the superconducting gap and the pseudogap in metallic cuprates for any doping have universal features. The linewidth is linear in energy below a scale ωc and constant above. The cusp in the linewidth at ωc mandates, due to causality, a waterfall, i.e., a vertical feature in the dispersion. These features are predicted by a recent microscopic theory. We find that all data can be quantitatively fitted by the theory with a coupling constant λ0 and an upper cutoff at ωc, which vary by less than 50% among the different cuprates and for varying dopings. The microscopic theory also gives these values to within factors of O(2).

Source-reported materials — not catalogue approval

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