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
收藏
页码：500 / 507
页数：8
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