Bose-Hubbard Model in Checkerboard Superlattices with a Magnetic Field  

作　　者：黄备兵 完绍龙 

机构地区：[1]Department of Experiment Teaching,Yancheng Institute of Technology [2]Institute for Theoretical Physics and Department of Modern Physics,University of Science and Technology of China

出　　处：《Communications in Theoretical Physics》2011年第5期807-812,共6页理论物理通讯（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant No.10675108;Foundation of Yancheng Institute of Technology under Grant No.XKR2010007

摘　　要：In this paper we investigate classical and quantum phase transitions of Bose-Hubbard model in checkerboard superlattices with a magnetic field at the mean-field level. By analyzing stability of normal state phase boundaries are obtained analytically for zero and finite temperature in a unified theoretical frame and easily extended to the situation without the magnetic field. All results illustrate that the introduction of the magnetic field enhances the stability of normal state and Mort insulator. In addition we also note that the critical hopping term presents an oscillating behavior inversely following the upper boundary of Hofstadter butterfly.

关 键 词：phase diagram Bose-Hubbard model checkerboard superlattice magnetic field 

分 类 号：O512[理学—低温物理]