耗散两态系统的动力学特性  

DYNAMICS OF THE DISSIPATIVE TWO-STATE SYSTEM

作　　者：衣学喜[1] 张朝民[2] 王东仁[3] 

机构地区：[1]东北师范大学物理研究所 [2]佳木斯工学院物理教研室,佳木斯154007 [3]东北师范大学化学系,长春130024

出　　处：《光子学报》1997年第9期771-776,共6页Acta Photonica Sinica

基　　金：吉林省科委青年研究基金

摘　　要：利用Born－Oppenheimer近似研究了零温时耗散两态系统的动力学特性．在不同环境谱分布下，给出了两态之间的跃迁几率随时间的变化．数值结果表明：当环境的谱分布为Ohmic形式时，跃迁几率是一个衰减的函数；而当谱分布为随机取值时，跃迁几率具有“量子跳跃”的特性．与之相对比，我们还给出了当把环境等价成无穷多个谱振子的集合时，跃迁几率随时间的变化．Based on the Born-Oppenheimer approximation,the zero-temperature dynamics of the two-state system is studied in this paper. Treating the bath as bosons,the transition probability iS givenand discussed for various spectral distribution of the reservoir. As a result of computer siinulation,thetransition probability displays a .damped oscillation function of time, when the spectral distrubutiontakes so-called the Ohmic form with a cut-off mp,whereas the quantum jump appears in the transitionprobability when the spectral distribution is random with the same cut - off. For the purpose ofcomparison, the temporal properties of the probability is also derived and discussed for the case inwhich the bath is treated as infinite 0scillators.

关 键 词：耗散两态系统 B-O近似 量子跃迁 

分 类 号：O413[理学—理论物理]