NONCONVENTIONAL BEHAVIOR OF THE ONE-BAND HUBBARD HAMILTONIAN IN 2 DIMENSIONS

被引：13

作者：

GALAN, J ^{[1
]}

GUINEA, F ^{[1
]}

VERGES, JA ^{[1
]}

CHIAPPE, G ^{[1
]}

LOUIS, E ^{[1
]}

机构：

[1] UNIV ALICANTE, DEPT FIS APLICADA, E-03080 ALICANTE, SPAIN

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.46.3163

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The wave-function renormalization constant Z has been calculated for the one-band Hubbard model in the square lattice. Near half-filling the Hamiltonian has been solved on finite clusters (up to 16 x 16) by means of the unrestricted Hartree-Fock approximation, whereas at high dilutions (two electrons) exact calculations have been carried out. The region of the parameter space where the system shows nonconventional behavior (Z = 0) is close to half-filling. For a given value of the Coulomb repulsion, Z vanishes at low dopings, and becomes finite as doping is increased. For very large U the constant Z remains finite for all dopings, excluding half filling. These results are cast into a plausible phase diagram.

引用

页码：3163 / 3166

页数：4

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