量子光学学报, 2017, 23 (3): 261, 网络出版: 2017-11-07
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
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 Dicke model Atom-light nonlinear interaction Quantum phase transition Spin-coherent-state variational method
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。
Abstract
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 ground-state properties such as population inversion, bistable normal phase, and the coexistence of normal-superradiant phases in both the blue and red detuning.
刘妮, 赵秀琴, 梁九卿. 非线性相互作用诱导下光腔中超冷原子的新奇量子相变[J]. 量子光学学报, 2017, 23(3): 261. LIU Ni, ZHAO Xiu-qin, LIANG Jiu-qing. Nonlinear-interaction-induced Quantum Phase Transition of a Bose-Einstein Condensate in an Optical Cavity[J]. Acta Sinica Quantum Optica, 2017, 23(3): 261.