双模Dicke模型的一级量子相变  

Firstorder quantum phase transition in the two-mode Dicke model

作　　者：俞立先[1,2] 梁奇锋[2] 汪丽蓉[3] 朱士群[1] 

机构地区：[1]苏州大学物理科学与技术学院,苏州215006 [2]绍兴文理学院数理信息学院,绍兴312000 [3]山西大学激光光谱研究所,太原030006

出　　处：《物理学报》2014年第13期156-161,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11074184;11275129;61275211);浙江省自然科学基金(批准号:LY13A040001);浙江省教育厅科研项目(批准号:Y201122352)资助的课题~~

摘　　要：多光场与多粒子相互作用的多模Dicke模型不但存在着更为丰富的量子相,而且在量子信息中有着重要的应用.本文运用Holstein-Primakoff变换和玻色扩展法研究双模Dicke模型的基态特性并从理论上发现了一个新的一级量子相变.该相变在实验上可以通过测量平均光子数或原子布居数进行观察.The multi-mode Dicke model, which describes many atoms interacting with the multi-mode photons, has attracted much attention; it not only exhibits rich quantum phases, but also has an important application in quantum informa-tion. In this paper, we explore the ground-state properties of the two-mode Dicke model by the Holstein-Primakoff transformation and Boson expansion method, and theoretically predict a new first-order quantum phase transition. In the experiment, this quantum phase transition could be detected by measuring the mean-photon number or the atom population.

关 键 词：双模Dicke模型 基态能 量子相变 

分 类 号：O431.2[机械工程—光学工程]