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Magnetism and phase separation in the ground state of the Hubbard model |
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| Authors: | R. Zitzler Th. Pruschke R. Bulla |
| Affiliation: | Institut für Theoretische Physik I, Universit?t Regensburg, 93040 Regensburg, Germany, DE Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universit?t Augsburg, 86135 Augsburg, Germany, DE |
| Abstract: | 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 stabilize a Néel 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. Received 9 January 2002 Published online 25 June 2002 |
| Keywords: | PACS. 71.27.+a Strongly correlated electron systems – 71.30.+h Metal-insulator transitions and other electronic transitions – 74.25.Jb Electronic structure |
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