Ferromagnetism in one-dimensional Hubbard model induced by the next-nearest-neighbor hopping at electron density 3/2

被引：0

作者：

杨媛媛 ^{[1
]}

张健 ^{[1
]}

潘晖 ^{[1
]}

王海龙 ^{[1
]}

机构：

[1] State Key Laboratory of Software Development Environment and Department of Physics,Beijing University of Aeronautics and Astronautics

来源：

Chinese Physics B | 2014年 / 23卷 / 11期

基金：

北京市自然科学基金; 中国国家自然科学基金;

关键词：

ferromagnetism; frustration effect; random phase approximation;

D O I：

暂无

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Ferromagnetism in the one-dimensional Hubbard model with the next-nearest-neighbor hopping is explored by using the exact-diagonalization method in a small cluster and the equation-of-motion method in the thermodynamic limit with electron density n = 3/2. With these two complementary methods, it is found that an intermediate value of the next-nearestneighbor hopping amplitude t1 tends to stabilize the fully polarized ferromagnetic state under the condition that the on-site coulomb interaction U is sufficiently large in our model. The ground-state phase diagram of the model is presented in the t;–U plane.

引用

页码：454 / 457

页数：4

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