Quantum phases of the Bose-Hubbard model in optical superlattices

被引：31

作者：

Chen, Bo-Lun ^{[1
]}

Kou, Su-Peng ^{[1
]}

Zhang, Yunbo ^{[2
]}

Chen, Shu ^{[3
]}

机构：

[1] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China

[2] Shanxi Univ, Inst Theoret Phys, Taiyuan 030006, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW A | 2010年 / 81卷 / 05期

关键词：

BOSONS; GAS; SUPERFLUID; INSULATOR; DIAGRAM; ATOMS;

D O I：

10.1103/PhysRevA.81.053608

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We analyze the quantum phases of multicomponent Bose-Hubbard models in optical superlattices based on a mean-field method, that is, the decoupling approximation. The global phase diagrams exhibit complex patterns with various charge-density-wave orders for both one-and two-component cases. We further calculate the effective spin excitations for the two-component case in the strong-coupling region at unit filling, and show the existence of a spin-density-wave order. The results of our study can be tested straightforwardly with current cold-atom experimental techniques.

引用

页数：9

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