Cluster perturbation theory for Hubbard models -: art. no. 075129

被引：192

作者：

Sénéchal, D ^{[1
]}

Perez, D ^{[1
]}

Plouffe, D ^{[1
]}

机构：

[1] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.66.075129

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cluster perturbation theory is a technique for calculating the spectral weight of Hubbard models of strongly correlated electrons, which combines exact diagonalizations on small clusters with strong-coupling perturbation theory at leading order. It is exact in both the strong- and weak-coupling limits and provides a good approximation to the spectral function at any wave vector. Following the paper by Senechal [Phys. Rev. Lett. 84, 522 (2000)], we provide a more complete description and derivation of the method. We illustrate some of its capabilities, in particular regarding the effect of doping, the calculation of ground state energy and double occupancy, the disappearance of the Fermi surface in the t-t(') Hubbard model, and so on. The method is applicable to any model with on-site repulsion only.

引用

页码：751291 / 7512911

页数：11

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