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

Abstract

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.

Keywords: ferromagnetism frustration effect random phase approximation

Received: 21 November 2013
Revised: 10 April 2014
Accepted manuscript online:

PACS:	71.10.Fd	(Lattice fermion models (Hubbard model, etc.))
	71.30.+h	(Metal-insulator transitions and other electronic transitions)
	71.27.+a	(Strongly correlated electron systems; heavy fermions)

Fund:

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).

Corresponding Authors: Wang Hai-Long
E-mail: nhlwang@buaa.edu.cn

Cite this article:

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 2014 Chin. Phys. B 23 117101

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

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