半导体量子阱中传播效应对子带间拉比振荡的影响

通过求解麦克斯韦-布洛赫方程组，分别在存在传播效应和无传播效应两种情况下，研究了调制掺杂的半导体量子阱中子带间的拉比振荡。研究发现，与电子-电子之间的相互作用的非线性相比较，传播效应对拉比振荡的影响更大；在不考虑传播效应时，脉冲可以使量子阱中的电子实现一次完整的布居反转，但是当传播效应存在情况下，完全的粒子数反转已不能实现。另外，研究还发现通过改变载流子的密度可以改变传播效应所产生的影响。

We investigate intersubband Rabi flopping in modulation-doped semiconductor quantum wells with and without the propagation effects. respectively. It is shown that propagation effects have a larger impact oil Rabi flopping than the nonlinearities rooted from electron-electron interactions in multiple quantum wells. By using ultrashort pi pulses, an almost complete population inversion exists if the propagation effects are not considered; while no complete population inversion occurs in the presence of propagation effects. Furthermore. the magnitude of the impact of propagation effects may be controlled by varying the carrier density.

National Natural Sciences Foundation of China [60708008]