  We study the optical conductivity of the one-band Hubbard model in the N\'eel
state at half filling at T=0 using the dynamical mean-field theory. For small
values of the Coulomb parameter clear signatures of a Slater insulator expected
from a weak-coupling theory are found, while the strongly 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 transition between these
two limiting cases but rather a smooth crossover as a function of the Coulomb
interaction.

Condensed Matter