非对称耦合量子阱子带间光吸收的自旋多稳定性
Spin multistability of the intersubband optical absorption in asymmetric coupled quantum wells
摘要：
研究了InSb基隧道耦合量子阱子带间光吸收的多稳态行为。我们考虑四个子级来自塞曼自旋分裂的两个最深的水平，造成的弱面内磁场。光激发与强烈的太赫兹泵产生的自旋子级之间的非平衡电子的重新分配。基于矩阵密度，我们描述了这种电子再分布的平衡方程系统的电子浓度。再分配产生光致自洽势，引起能级间能量距离的重整化。根据总电子浓度和泵浦效率，我们发现不同的多稳态行为的子带间的光吸收谱。
英文摘要：
We study the multistable behavior of the intersubband optical absorption for InSb-based tunnel coupled quantum wells. We consider four sublevels coming from the Zeeman spin splitting of the two deepest levels, caused by a weak in-plane magnetic field. Photoexcitation with an intense terahertz pump produces the redistribution of nonequilibrium electrons between the spin sublevels. Based on the matrix density, we describe this electron redistribution by means of a system of balance equations for electron concentrations. The redistribution produces a photoinduced self-consistent potential, giving rise to the renormalization of energy distance between levels. Depending on total electron concentration and pumping efficiency, we find different multistable behaviors in the intersubband optical absorption spectrum.
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