摘要
本文采用统计算符及双时格林函数的方法研究了在外场作用下自旋1/2系统的时间演化过程,系统中的自旋向上和向下两种粒子可以通过外场相互转化。粒子密度的时间演化呈振荡行为,同时本文也给出了系统的元激发谱。
Using the statistical operatior and double-time Green's function,we study the time evolu- tion of a spin-1/2 system via an external field.A spin±1/2 particle can be transformed into each other via an external field in the system.The time evolution of the density of the parti- des in the system is an oscillatory fashion.The excited spectrum is also given in the present pa- per.
出处
《哈尔滨师范大学自然科学学报》
CAS
1997年第2期39-42,共4页
Natural Science Journal of Harbin Normal University
