ONE-DIMENSIONAL (T, U, X) MODEL - GROUND-STATE PHASE-DIAGRAM IN A MEAN-FIELD-TYPE APPROXIMATION

被引：13

作者：

BUZATU, FD ^{[1
]}

机构：

[1] INST ATOM PHYS,INST PHYS & NUCL ENGN,DEPT THEORET PHYS,R-76900 MAGURELE,ROMANIA

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.49.10176

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A one-dimensional lattice system of electrons with on-site (U) and bond-site (X) interactions is considered. Using the Green-function formalism in the Bloch representation, the occurrence of the possible instabilities in the ground state is analyzed within a mean-field-type approximation. At half filling, the X term does not modify the ground-state phase diagram of the Hubbard model; at lower (higher) band fillings a rather small bond-site attraction (repulsion) can favor the pairing of electrons.

引用

页码：10176 / 10180

页数：5

共 32 条

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