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Static vs. dynamical mean field theory of Mott antiferromagnets

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arxiv cond-mat/0511442 v2 pith:XQKGMDY6 submitted 2005-11-17 cond-mat.str-el

G. Sangiovanni , A. Toschi , E. Koch , K. Held , M. Capone , C. Castellani , O. Gunnarsson , S.-K. Mo
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J. W. Allen H.-D. Kim A. Sekiyama A. Yamasaki S. Suga P. Metcalf
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keywords fieldmeandynamicaltheorydifferenceshartree-fockstaticalready
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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 V$_2$O$_3$ show spectra qualitatively well described by dynamical mean field theory.

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