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

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

中国物理B ›› 2015, Vol. 24 ›› Issue (7): 77101-077101.doi: 10.1088/1674-1056/24/7/077101

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

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

张亮亮^a, 黄金^a, 段丞博^b, 王为忠^a

a Department of Physics, Wuhan University, Wuhan 430072, China;
b College of Science, Chang'an University, Xi'an 710064, China

收稿日期:2014-11-12 修回日期:2015-01-28 出版日期:2015-07-05 发布日期:2015-07-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50573059 and 10874132).

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

Zhang Liang-Liang (张亮亮)^a, Huang Jin (黄金)^a, Duan Cheng-Bo (段丞博)^b, Wang Wei-Zhong (王为忠)^a

a Department of Physics, Wuhan University, Wuhan 430072, China;
b College of Science, Chang'an University, Xi'an 710064, China

Received:2014-11-12 Revised:2015-01-28 Online:2015-07-05 Published:2015-07-05
Contact: Zhang Liang-Liang E-mail:dlzhang@whu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50573059 and 10874132).

摘要/Abstract

摘要： 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.

关键词: metal-insulator transition, spin-density-wave, Hubbard superlattice

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.

Key words: metal-insulator transition, spin-density-wave, Hubbard superlattice

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

71.10.Fd

71.30.+h (Metal-insulator transitions and other electronic transitions) 73.21.Cd (Superlattices) 75.30.Fv (Spin-density waves)

张亮亮, 黄金, 段丞博, 王为忠. Structure-dependent metal—insulator transition in one-dimensional Hubbard superlattice[J]. 中国物理B, 2015, 24(7): 77101-077101.

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[J]. Chin. Phys. B, 2015, 24(7): 77101-077101.

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

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