Volume 56, Number 4, November 2001
|Page(s)||563 - 569|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 December 2003|
Phase diagram of the Hubbard model: Beyond the dynamical mean field
Department of Physics, University of Cincinnati - Cincinnati,
OH 45221, USA
2 Institut für Theoretische Physik, Universität Regensburg 93040 Regensburg, Germany
3 Forschungszentrum Karlsruhe - Postfach 3640, 76021 Karlsruhe, Germany
Accepted: 30 August 2001
The Dynamical Cluster Approximation (DCA) is used to study non-local corrections to the dynamical mean-field phase diagram of the two-dimensional Hubbard model. Regions of antiferromagnetic, d-wave superconducting, pseudo-gapped non-Fermi liquid, and Fermi liquid behaviors are found, in rough agreement with the generic phase diagram of the cuprates. The non-local fluctuations beyond the mean field both suppress the antiferromagnetism and mediate the superconductivity.
PACS: 71.10.-w – Theories and models of many-electron systems / 71.10.Hf – Non-Fermi liquid ground states, electron phase diagrams and phase transitions in model systems / 74.20.-z – Theories and models of superconducting state
© EDP Sciences, 2001
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