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 sidebands. Already for intermediate values of the interaction U the overall bandwidth is larger than in the Hartree-Fock mean field 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. RI Capone, Massimo/A-7762-2008
Static versus dynamical mean-field theory of Mott antiferromagnets
Capone, Massimo;
2006-01-01
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 sidebands. Already for intermediate values of the interaction U the overall bandwidth is larger than in the Hartree-Fock mean field 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. RI Capone, Massimo/A-7762-2008File in questo prodotto:
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