Slave-boson based configuration-interaction approach for the Hubbard model

被引：2

作者：

Seibold, G. ^{[1
]}

机构：

[1] Brandenburg Tech Univ Cottbus, Inst Phys, D-03013 Cottbus, Germany

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.77.235109

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Based on the Kotliar-Ruckenstein slave-boson scheme, we develop a configuration-interaction (CI) approach that is suitable to evaluate energy corrections for symmetry-broken saddle-point solutions. The theory is applied to spin-polaron states in the Hubbard model and compared with analogous results obtained within the Hartree-Fock approximation. In addition, we show that within the infinite D prescription of the Gutzwiller method a CI approach does not correct the variational result since in the thermodynamic limit matrix elements between different inhomogeneous states vanish due to an "orthogonality catastrophe."

引用

页数：9

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