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On the basis of Quantum-Monte-Carlo results the evolution of the spectralweight $A(\vec k, \omega)$ of the two-dimensional Hubbard model is studied frominsulating to metallic behavior. As observed in recent photoemissionexperiments for cuprates, the electronic excitations display essentiallydoping-independent features: a quasiparticle-like dispersive narrow band ofwidth of the order of the exchange interaction $J$ and a broad valence- andconduction-band background. The continuous evolution is traced back to one andthe same many-body origin: the doping-dependent antiferromagnetic spin-spincorrelation.

Quasiparticle Dispersion of the 2D Hubbard Model: From an Insulator to a Metal