SPECTRAL PROPERTIES AND BAND STRUCTURE OF CORRELATED ELECTRON-SYSTEMS

We present k-dependent one-particle spectra and corresponding effectiv e band structures for the 2D Hubbard model calculated within the dynam ical molecular field theory (DMFT). This method has proven to yield hi ghly nontrivial results for a variety of quantities but the question r emains open to what extent it is applicable to relevant physical situa tions. To address this problem we compare our results for spectral fun ctions to those obtained by QMC simulations. The good agreement suppor ts our notion that the DMFT is indeed a sensible ansatz for correlated models even in to d = 2.