Static versus dynamical mean-field theory of Mott antiferromagnets

被引：80
|
作者：
Sangiovanni, G.
Toschi, A.
Koch, E.
Held, K.
Capone, M.
Castellani, C.
Gunnarsson, O.
Mo, S. -K.
Allen, J. W.
Kim, H. -D.
Sekiyama, A.
Yamasaki, A.
Suga, S.
Metcalf, P.
机构：
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[2] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany
[3] CNR, Ist Sistemi Complessi, I-00185 Rome, Italy
[4] INFM, SMC, I-00185 Rome, Italy
[5] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[6] Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA
[7] Pohang Accelerator Lab, Pohang 790784, South Korea
[8] Osaka Univ, Grad Sch Engn, Dept Mat Phys, Toyonaka, Osaka 5608531, Japan
[9] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
来源：
PHYSICAL REVIEW B | 2006年 / 73卷 / 20期
关键词：
D O I：
10.1103/PhysRevB.73.205121
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 V2O3 show spectra qualitatively well described by dynamical mean-field theory.
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页数：5
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