GROUND-STATE OF THE U=INFINITY HUBBARD-MODEL WITH INFINITE-RANGE HOPPING

被引：12

作者：

VERGES, JA

GUINEA, F

GALAN, J

VANDONGEN, PGJ

CHIAPPE, G

LOUIS, E

机构：

[1] UNIV AUTONOMA MADRID,CSIC,INST CIENCIA MAT MADRID,E-28049 MADRID,SPAIN

[2] UNIV CARLOS III,ESCUELA POLITECN SUPER,E-28911 LEGANES,SPAIN

[3] RHEIN WESTFAL TH AACHEN,INST THEORET PHYS C,W-5100 AACHEN,GERMANY

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

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.49.15400

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The ground-state wave function and energy of the Hubbard model with unlimited hopping can be obtained for arbitrary fillings using the transformation recently introduced by Brandt and Giesekus. A simple linear behavior is obtained for the ground-state energy dependence on the number of particles: E(GS) = -2t(L - N), where -t is the hopping energy (t > 0), L is the number of sites, and N is the number of electrons. The ground state shows a very large total spin degeneracy. The system is shown to behave as a Fermi liquid with a spectral weight Z = 1 - N/L for all fillings less than 1 (N less-than-or-equal-to L).

引用

页码：15400 / 15403

页数：4

共 11 条

[1] HUBBARD AND ANDERSON MODELS ON PEROVSKITE-LIKE LATTICES - EXACTLY SOLVABLE CASES [J].