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

doi:10.1088/1674-1056/23/11/117101

中国物理B ›› 2014, Vol. 23 ›› Issue (11): 117101-117101.doi: 10.1088/1674-1056/23/11/117101

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

杨媛媛, 张健, 潘晖, 王海龙

State Key Laboratory of Software Development Environment and Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

收稿日期:2013-11-21 修回日期:2014-04-10 出版日期:2014-11-15 发布日期:2014-11-15
基金资助:
Project supported by the State Key Laboratory of Software Development Environment, China (Grant No. SKLSDE-2013ZX-21), the National Natural Science Foundation of China (Grant No. 50971011), and the Beijing Natural Science Foundation, China (Grant No. 1102025).

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

Yang Yuan-Yuan (杨媛媛), Zhang Jian (张健), Pan Hui (潘晖), Wang Hai-Long (王海龙)

State Key Laboratory of Software Development Environment and Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

Received:2013-11-21 Revised:2014-04-10 Online:2014-11-15 Published:2014-11-15
Contact: Wang Hai-Long E-mail:nhlwang@buaa.edu.cn
Supported by:
Project supported by the State Key Laboratory of Software Development Environment, China (Grant No. SKLSDE-2013ZX-21), the National Natural Science Foundation of China (Grant No. 50971011), and the Beijing Natural Science Foundation, China (Grant No. 1102025).

摘要/Abstract

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-nearest-neighbor 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 t₁-U plane.

关键词: ferromagnetism, frustration effect, random phase approximation

Abstract:

Key words: ferromagnetism, frustration effect, random phase approximation

中图分类号: (Lattice fermion models (Hubbard model, etc.))

71.10.Fd

71.30.+h (Metal-insulator transitions and other electronic transitions) 71.27.+a (Strongly correlated electron systems; heavy fermions)

杨媛媛, 张健, 潘晖, 王海龙. Ferromagnetism in one-dimensional Hubbard model induced by the next-nearest-neighbor hopping at electron density 3/2[J]. 中国物理B, 2014, 23(11): 117101-117101.

Yang Yuan-Yuan (杨媛媛), Zhang Jian (张健), Pan Hui (潘晖), Wang Hai-Long (王海龙). Ferromagnetism in one-dimensional Hubbard model induced by the next-nearest-neighbor hopping at electron density 3/2[J]. Chin. Phys. B, 2014, 23(11): 117101-117101.

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

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

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