Abstract
We study the optical conductivity of the one-band Hubbard model in the Néel state at half filling atT = 0 using the dynamical mean-field theory. For small values of the Coulomb parameter clearsignatures of a Slater insulator expected from a weak-coupling theory are found, while thestrongly correlated system can be well described in terms of a Mott–Heisenberg picture.However, in contrast to the paramagnet, we do not find any evidence for a transitionbetween these two limiting cases but rather a smooth crossover as a function of theCoulomb interaction.
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