Static vs. dynamical mean field theory of Mott antiferromagnets
  Studying the antiferromagnetic phase of the Hubbard model by dynamical mean field theory, we observe striking differences with static (Hartree-Fock) mean field: The Slater band is strongly renormalized and spectral weight is transferred to spin-polaron side bands. Already for intermediate values of the interaction $U$ the overall bandwidth is larger than in Hartree-Fock, and the gap is considerably smaller. Such differences survive any renormalization of $U$. Our photoemission experiments for Cr-doped V$_2$O$_3$ show spectra qualitatively well described by dynamical mean field theory. 
G. Sangiovanni, A. Toschi, E. Koch, K. Held, M. Capone, C. Castellani,   O. Gunnarsson, S.-K. Mo, J. W. Allen, H.-D. Kim, A....