Role of strong correlation in the recent ARPES experiments for cuprate superconductors

Details Role of strong correlation in the recent ARPES experiments for cuprate superconductors Role of strong correlation in the recent ARPES experiments for cuprate superconductors

2004-12-16

arxiv.org/abs/cond-mat/0412432v1

Phys. Rev. Lett. 94, 037001 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.94.037001

Motivated by recent photoemission experiments on cuprates, the low-lying excitations of a strongly correlated superconducting state are studied numerically. It is observed that along the nodal direction these low-lying one-particle excitations show a linear momentum dependence for a wide range of excitation energies and, thus, they do not present a kink-like structure. The nodal Fermi velocity $v_{\rm F}$, as well as other observables, are systematically evaluated directly from the calculated dispersions, and they are found to compare well with experiments. It is argued that the parameter dependence of $v_{\rm F}$ is quantitatively explained by a simple picture of a renormalized Fermi velocity.

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