2003/09/08 by Thomas Pruschke, Th Pruschke, R Zitzler +1 · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1088/0953-8984/15/46/006
published as J. Phys.: Condens. Matter 15, 7867 (2003) · 8 pages, 9 figures
arxiv created 2003/09/08 · arxiv updated 2009/12/01
We study the optical conductivity of the one-band Hubbard model in the Néel 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.