Universality of the single-particle spectra of cuprate superconductors

Details Universality of the single-particle spectra of cuprate superconductors Universality of the single-particle spectra of cuprate superconductors

2007-02-07

arxiv.org/abs/cond-mat/0702187v3

PRL 100, 057001 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures; accepted by Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.057001

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 has universal features. The linewidth is linear in energy below a scale $\omega_c$ and constant above. The cusp in the linewidth at $\omega_c$ 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 $\lambda_0$ and an upper cutoff at $\omega_c$ 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).

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