摘要
利用线性谐振子模型,给出了金属介质中电子的运动微分方程,导出其宏观极化强度的表达式,讨论了金属介质在外场突然变化时产生的瞬态感应极化情况,发现瞬态感应极化的相位总是落后于外场,最大可落后π/2,振幅的大小与初态和介质的阻尼系数有关,随时间按指数规律衰减,衰减的快慢由介质的阻尼系数和泵浦场的频率决定,具有一定的记忆效应。
By using linear harmonic oscillator model, the moving differential equation and the expression of polarization intensity were derived. Then the instantaneous transient phase and amplitude with change electric field were discussed. The result shows that the delay of phase is π/2 at maximum, the magnitude of amplitude of polarization intensity is in circumstance associate with the original state of the dielectric. The delay is exponential with time and associated with dephasing of the quantum coherent carrier.
出处
《西南科技大学学报》
CAS
2007年第2期82-85,共4页
Journal of Southwest University of Science and Technology
基金
四川省优秀教学成果孵化项目(编号:210-039910)
关键词
金属介质
瞬态感应极化
相位
振幅
metal dielectric
instantaneous induction polarization
transient phase
amplitude
