Spatial Dependent Spontaneous Emission of an Atom in a Semi-Infinite Waveguide of Rectangular Cross Section  

作　　者：Hai-Xi Song Xiao-Qi Sun Jing Lu Lan Zhou 宋海希;孙晓祺;卢竞;周兰(Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center of Quantum Effects and Applications, Hunan Normal University)

机构地区：Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center of Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China

出　　处：《Communications in Theoretical Physics》2018年第1期59-67,共9页理论物理通讯（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant Nos.11374095,11422540,11434011,and 11575058;National Fundamental Research Program of China(the 973 Program)under Grant No.2012CB922103;Hunan Provincial Natural Science Foundation of China under Grant No.11JJ7001

摘　　要：We study a quantum electrodynamics(QED) system made of a two-level atom and a semi-infinite rectangular waveguide, which behaves as a perfect mirror in one end. The spatial dependence of the atomic spontaneous emission has been included in the coupling strength relevant to the eigenmodes of the waveguide. The role of retardation is studied for the atomic transition frequency far away from the cutoff frequencies. The atom-mirror distance introduces different phases and retardation times into the dynamics of the atom interacting resonantly with the corresponding transverse modes. It is found that the upper state population decreases from its initial as long as the atom-mirror distance does not vanish, and is lowered and lowered when more and more transverse modes are resonant with the atom. The atomic spontaneous emission can be either suppressed or enhanced by adjusting the atomic location for short retardation time.There are partial revivals and collapses due to the photon reabsorbed and re-emitted by the atom for long retardation time.

关 键 词：quantum optics WAVEGUIDE spontaneous emission RETARDATION 

分 类 号：O413.2[理学—理论物理]