Excitation Spectrum and Momentum Distribution of Bose-Hubbard Model with On-site Two- and Three-Body Interaction

被引：2
作者：
Huang Bei-Bing [1 ]
Wan Shao-Long [2 ,3 ]
机构：
[1] Yancheng Inst Technol, Dept Expt Teaching, Yancheng 224051, Peoples R China
[2] Univ Sci & Technol China, Inst Theoret Phys, Hefei 230026, Peoples R China
[3] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
来源：
COMMUNICATIONS IN THEORETICAL PHYSICS | 2013年 / 59卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Bose-Hubbard model; three-body interaction; excitation spectrum; momentum distribution; PHASE-TRANSITION; SUPERFLUID; INSULATOR; FIELD; ATOMS; STATE; GAS;
D O I：
10.1088/0253-6102/59/3/09
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
引用
收藏
页码：295 / 301
页数：7
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