Variational study of ferromagnetism in the t(1)-t(2) Hubbard chain

被引：3

作者：

Daul, S

Pieri, P

Dzierzawa, M

Baeriswyl, D

Fazekas, P

机构：

[1] UNIV BOLOGNA,DIPARTIMENTO FIS,INFM,I-40126 BOLOGNA,ITALY

[2] UNIV BOLOGNA,IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY

[3] RES INST SOLID STATE PHYS,H-1525 BUDAPEST,HUNGARY

来源：

PHYSICA B | 1997年 / 230卷

关键词：

ferromagnetism; Hubbard model; variational wave function;

D O I：

10.1016/S0921-4526(96)00794-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A one-dimensional Hubbard model with nearest and (negative) next-nearest neighbour hopping is studied variationally. This allows to exclude saturated ferromagnetism for U < U-c. The variational boundary U-c(n) has a minimum at a ''critical density'' n(c) and diverges for n --> 1.

引用

页码：1021 / 1023

页数：3

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