Structure-dependent metal—insulator transition in one-dimensional Hubbard superlattice

doi:10.1088/1674-1056/24/7/077101

Abstract We investigate the charge and spin gaps, and the spin structure in half-filled one-dimensional Hubbard superlattices with one repulsive site and L₀ free sites per unit cell. For odd L₀, it is correlated metal at the particle–hole symmetric point, and then turns into band insulator beyond this point. For even L₀, the system has a Mott insulator phase around the particle–hole symmetric point and undergoes a metal–insulator transition with on-site repulsion U increasing. For large U, there exists a multiperiodic spin structure, which results from the ferromagnetic (antiferromagnetic) correlation between the nearest neighboring repulsive sites for odd (even) L₀.

Keywords: metal-insulator transition spin-density-wave Hubbard superlattice

Received: 12 November 2014
Revised: 28 January 2015
Accepted manuscript online:

PACS:	71.10.Fd	(Lattice fermion models (Hubbard model, etc.))
	71.30.+h	(Metal-insulator transitions and other electronic transitions)
	73.21.Cd	(Superlattices)
	75.30.Fv	(Spin-density waves)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50573059 and 10874132).

Corresponding Authors: Zhang Liang-Liang
E-mail: dlzhang@whu.edu.cn

Cite this article:

Zhang Liang-Liang (张亮亮), Huang Jin (黄金), Duan Cheng-Bo (段丞博), Wang Wei-Zhong (王为忠) Structure-dependent metal—insulator transition in one-dimensional Hubbard superlattice 2015 Chin. Phys. B 24 077101

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Structure-dependent metal—insulator transition in one-dimensional Hubbard superlattice

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