Superfluid-Insulator Phase Transitions of the Extended Bose-Hubbard Model

被引：1

作者：

Su, Xiao Qiang ^{[1
]}

Wang, An Min ^{[2
]}

机构：

[1] Shanxi Normal Univ, Coll Phys & Informat Engn, Linfen 041004, Peoples R China

[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China

来源：

CHINESE JOURNAL OF PHYSICS | 2012年 / 50卷 / 03期

基金：

中国国家自然科学基金;

关键词：

NEAR-NEIGHBOR REPULSION; OPTICAL LATTICE; ANTIFERROMAGNETISM; ATOMS;

D O I：

暂无

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this paper, the extended Bose-Hubbard model with nearest neighbor interaction is discussed using the method of Green functions in the mean-field approximation. Starting from the two-sublattice approach developed by Hewson and ter Haar, we solve the equations of motion of the Green functions and obtain the energy-band structure. Then, by taking the limit of a vanishing energy gap in the energy-band structure, we find the superfluid-insulator phase boundaries for an integer filling density. Finally, the ground state phase boundaries of the one-dimension extended Bose-Hubbard model for rho = 1 are presented, and the tricritical point is obtained.

引用

页码：500 / 507

页数：8

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