Magnetism and Phase Separation in the Ground State of the Hubbard Model

Details Magnetism and Phase Separation in the Ground State of the Hubbard Model Magnetism and Phase Separation in the Ground State of the Hubbard Model

2002-01-10

arxiv.org/abs/cond-mat/0201145v1

Eur. Phys. J. B 27, 473-481 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 11 figures

Scientific paper

10.1140/epjb/e2002-00180-3

We discuss the ground state magnetic phase diagram of the Hubbard model off half filling within the dynamical mean-field theory. The effective single-impurity Anderson model is solved by Wilson's numerical renormalization group calculations, adapted to symmetry broken phases. We find a phase separated, antiferromagnetic state up to a critical doping for small and intermediate values of U, but could not stabilise a Neel state for large U and finite doping. At very large U, the phase diagram exhibits an island with a ferromagnetic ground state. Spectral properties in the ordered phases are discussed.

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