Phase diagram of the Hubbard model: Beyond the dynamical mean field
M. Jarrell; Th. Maier; M. H. Hettler; A. N. Tahvildarzadeh
Журнал:
EPL (Europhysics Letters)
Дата:
2001-11-01
Аннотация:
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.
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