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Evolution of the hole spectral function along the Gamma-(pi,pi) cut isstudied in the antiferromagnetic state of the Hubbard model. The kink in thecalculated hole dispersion, the sharp spectral-weight transfer between thebranches, and the drastically suppressed coherent spectral weight near k=(0,0),as observed recently in the high-resolution ARPES studies of cuprateantiferromagnets, are shown to be strongly enhanced by finite-Udouble-occupancy effects. Together with the anomalous spin-wave dispersionobserved earlier in high-resolution neutron-scattering studies, the presentstudy provides further evidence of a unified description of magnetic andelectronic excitations in cuprate antiferromagnets in terms of the Hubbardmodel.

High energy kink in the dispersion of a hole in an antiferromagnet -- double-occupancy effects on electronic excitations