Static vs. dynamical mean field theory of Mott antiferromagnets
Abstract
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 V2O3 show spectra qualitatively well described by dynamical mean field theory.
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