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Dynamical Mean-Field Theory for Doped Antiferromagnets

1998; American Physical Society; Volume: 80; Issue: 11 Linguagem: Inglês

10.1103/physrevlett.80.2393

1092-0145

Marcus Fleck, A. I. Liechtenstein, Andrzej M. Oleś, Lars Hedin, В. И. Анисимов,

Magnetic and transport properties of perovskites and related materials

We have generalized the dynamical mean-field theory to study the doping dependence of the crossover from antiferromagnetic to short-range order modelled by an incommensurate spin density wave in the Hubbard model. The local selfenergy which includes spin fluctuations gives quasiparticle weights and spectral properties in good agreement with quantum Monte Carlo and exact diagonalization data in two dimensions. The spectra at finite doping are characterized by a Mott-Hubbard `gap' accompanied by a pseudogap induced by the local spin order.