非线性相互作用诱导下光腔中超冷原子的新奇量子相变  

Nonlinear-interaction-induced Quantum Phase Transition of a Bose-Einstein Condensate in an Optical Cavity

作　　者：刘妮[1] 赵秀琴 梁九卿[1] 

机构地区：[1]山西大学理论物理研究所,山西太原030006

出　　处：《量子光学学报》2017年第3期261-269,共9页Journal of Quantum Optics

基　　金：国家自然科学基金(批准号:11404198;11275118;91430109;61505100);山西省高等学校科技创新项目(批准号:2014102);山西大学科研启动金(批准号:011151801004);山西大学本科生科研训练项目(批准号:2017015304);国家基础科学人才培养基金(批准号:J1103210)

摘　　要：Dicke模型是描述N个二能级原子与单模腔场集体耦合的系统。本文在标准Dicke模型的基础上引入原子-光非线性相互作用,使用自旋相干态变分方法从理论上给出基态能量泛函,并且在实验参数下通过可调的非线性原子-光相互作用给出了宏观多粒子量子态的丰富结构。本文主要呈现出蓝失谐和红失谐下原子数反转态、双稳的正常相、共存的正常-超辐射相等丰富的基态特性。The Dicke model describes that all two-level atoms are coupled with a single-mode cavity field.In this paper,the atom-photon nonlinear interaction is introduced based on the standard Dicke model.By means of the spin-coherent-state variational method,the ground state energy functional obtained theoretically and the rich structure of macroscopic many-particle quantum states is given by manipulating the nonlinear atom-photon interaction in the experiment parameters.We mainly present the rich groundstate properties such as population inversion,bistable normal phase,and the coexistence of normalsuperradiant phases in both the blue and red detuning.

关 键 词：DICKE模型 原子-光非线性相互作用 量子相变 自旋相干态变分法 

分 类 号：O414[理学—理论物理]