微腔辅助的自旋动力学特性和超辐射相变  

Microcavity-Assisted Spin Dynamics Characteristics and Superradiant Phase Transition

作　　者：崔超 冯彦林 Cui Chao;Feng Yanlin(Shandong Provincial Engineering and Technical Center of Light Manipulations,School of Physics and Electronics,Shandong Normal University,Jinan 250358,Shandong,China)

机构地区：[1]山东师范大学物理与电子科学学院,光场调控及应用中心,山东济南250358

出　　处：《光学学报》2024年第5期245-252,共8页Acta Optica Sinica

基　　金：国家自然科学基金(11947226,12004224);中国博士后面上资助(2019M662421)。

摘　　要：将玻色爱因斯坦凝聚制备在随时间简谐振荡的势场中,并与光学微腔系统相耦合,建立新的模型。分析了该模型中原子受到的有效磁场和简谐势阱的振动强度等因素对超辐射量子相变的影响,并探究了其随时间振荡的自旋动力学特性。提出的新模型具有重要的研究意义,且为深入研究腔量子调控提供了可行方案。Objective Compared with the traditional method of changing spin freedom through external magnetic fields,the spinorbit coupling,which utilizes the coupling between the spin freedom and the motion freedom of atoms,is a new method for regulating spin.With the continuous realization of artificial spin-orbit coupling in cold atomic systems in experiments,many novel physical phenomena based on spin-orbit coupling have been widely promoted.In addition,since the realization of the superradiant quantum phase transition in experiments in 2010,the system of coupling ultracold atomic gas and cavity quantum electrodynamics has become an ideal platform for exploring novel many-body physics,which has aroused a research boom among theoretical scientists and experimental scientists.This coupling system couples ultracold atoms into a high-precision optical microcavity.Under specific electromagnetic boundary conditions,light interacts with ultracold atoms and induces novel many-body quantum properties.In this coupling system,one can not only explore the complex quantum behavior induced by the long-range interaction among atoms mediated by cavity photons but also understand the collective dynamical properties of cavity photons and ultracold atoms at the single-photon level.At the same time,the optical microcavity has both driving and dissipation,and it is a natural non-equilibrium system,which allows one to study the nonequilibrium steady-state dynamical properties.However,the time-dependent cavity-assisted spin dynamics has not been considered experimentally and theoretically.On the one hand,the time-dependent Schrdinger equation is difficult to obtain an exact analytical solution mathematically,and on the other hand,the physical process expressed by the timedependent Schr?dinger equation involves complex energy changes,time evolution,and interaction problems,which makes it difficult to solve.In view of these problems,we proposed a method for realizing the superradiant phase transition with the assistance of an optical microcavity

关 键 词：量子光学 光学微腔 超辐射 自旋动力学 玻色爱因斯坦凝聚 

分 类 号：O469[理学—凝聚态物理]