具有局域E_2对称性的推广玻色-哈巴德模型  

An extended Bose-Hubbard model with local E_2 symmetry

作　　者：潘峰[1] 梁霄[1] 李晓彤[1] 张苧允 王茜昀 李雪[1] 

机构地区：[1]辽宁师范大学物理与电子技术学院,辽宁大连116029

出　　处：《辽宁师范大学学报（自然科学版）》2014年第4期474-478,共5页Journal of Liaoning Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(11175078;11375080);辽宁省普通高教本科教改研究项目(UPRP20140326)

摘　　要：利用局域的E2生成元构造了一种具有准严格解的推广玻色-哈巴德模型.与原来的玻色-哈巴德模型类似,推广玻色-哈巴德模型可用于描述格点玻色系统从超流相到Mott绝缘相的量子相变.介绍了模型的准严格解及其显著特点,给出了一维推广玻色-哈巴德模型填充数ρ=1时的相图,并计算了N=M=14时体系的基态纠缠度随控制参量的变化特征.An extended Bose‐Hubbard model is constructed by local E2 generators built from the boson operators .Similar to the original Bose‐Hubbard model ,it can be used to describe the quantum phase transition from the super‐fluid phase to the Mott insulator phase .Some notable features of the quasi‐exact solutions to the model are discussed .Phase diagram of the 1D model with filling factor ρ=1 is determined .Ground state entanglement measure for N= M=14 as function of the control parameter of the system is also calculated .

关 键 词：推广玻色-哈巴德模型 基态性质 量子相变 纠缠度量 

分 类 号：O41[理学—理论物理]