Abstract
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 kinklike structure. The nodal Fermi velocity vF, 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 vF is quantitatively
explained by a simple picture of a renormalized Fermi velocity.
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