Excitation Spectrum and Momentum Distribution of Bose—Hubbard Model with On-site Two- and Three-Body Interaction
Excitation Spectrum and Momentum Distribution of Bose—Hubbard Model with On-site Two- and Three-Body Interaction
复制标题
DOI：
10.1088/0253-6102/59/3/09
复制
发表时间：
2012-12
影响因子：
3.1
通讯作者：
Beibing Huang;S. Wan
中科院分区：
文献类型：
--
作者：
Beibing Huang;S. Wan
在Sengupta和Dupuis强耦合方法的框架下，导出了正方形光晶格中两体和三体在位相互作用的玻色-哈伯德模型的有效作用量.从这个有效作用出发，在鞍点近似下考虑高斯涨落，计算了超流-Mott绝缘体（MI）相变、激发谱和两相动量分布.此外，还讨论了三体相互作用的影响。
An effective action for Bose-Hubbard model with two- and three-body on-site interaction in a square optical lattice is derived in the frame of a strong-coupling approach developed by Sengupta and Dupuis. From this effective action, superfluid-Mott insulator (MI) phase transition, excitation spectrum and momentum distribution for two phases are calculated by taking into account Gaussian fluctuation about the saddle-point approximation. In addition the effects of three-body interaction are also discussed.