Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 15, Issue 46, Pages 7867-7879Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/15/46/006
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We study the optical conductivity of the one-band Hubbard model in the Neel 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.
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