https://doi.org/10.1140/epjb/e2002-00180-3
Magnetism and phase separation in the ground state of the Hubbard model
1
Institut für Theoretische Physik I, Universität
Regensburg, 93040 Regensburg, Germany
2
Theoretische Physik III, Elektronische Korrelationen und
Magnetismus, Institut für Physik, Universität Augsburg, 86135 Augsburg,
Germany
Corresponding author: a thomas.pruschke@physik.uni-augsburg.de
Received:
9
January
2002
Published online:
25
June
2002
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 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.
PACS: 71.27.+a – Strongly correlated electron systems / 71.30.+h – Metal-insulator transitions and other electronic transitions / 74.25.Jb – Electronic structure
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002
