基于费米黄金法则,理论计算了Cd1-xMnxTe/CdTe量子阱中第一激发态到基态的 电子-LO声子的散射率,讨论了平均散射率随阱宽、温度及Mn组分的变化规律。结果 表明:电子-LO声子的散射率随总初态能的增大逐渐减小;散射率和平均散射率随阱宽 增大先增加后减小,最大值出现在20 nm阱宽附近,当阱宽大于等于20 nm时散射会发生“中断”; 散射率和平均散射率随温度的增加逐渐增大,温度较低时 平均散射率的变化不明显,温度较高时变化显著;量子阱中电子-LO声子的平均散射率 随Mn组分的增大逐渐减小。

The electron-LO phonon scattering rate of the first excited state to the ground state in Cd1-xMnxTe/CdTe quantum well is calculated theoretically based on Fermi golden rule, and the variation of average scattering rate with the well width, temperature and Mn component is also discussed. Results show that the electron-LO phonon scattering rate decreases gradually with increasing of the total initial energy. The scattering rate and mean scattering rate increases up to their maxima which appears at 20 nm of the well width, then begins to decrease as the well width increases. When quantum well width is greater than 20 nm, the ‘cut-off’ will occur in scattering. The scattering rate and mean scattering rate increase monotonically with increasing of temperature. In the case of low temperature, the variation of mean scattering rate is not obvious, but it changes distinctly when the temperature is relatively high. The mean scattering rate of electron-LO phonon in quantum well decreases with increasing of Mn component.