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We study the spectral function of the 2D Hubbard model using clusterperturbation theory, and the density matrix renormalization group as a clustersolver. We reconstruct the two-dimensional dispersion at, and away fromhalf-filling using 2xL ladders, with L up to 80 sites, yielding results withunprecedented resolution in excellent agreement with quantum Monte Carlo. Themain features of the spectrum can be described with a mean-field dispersion,while kinks and pseudogap traced back to scattering between spin and chargedegrees of freedom.

Spectral function of the 2D Hubbard model: a density matrix renormalization group plus cluster perturbation theory study