Photon spin charge texture in nano-semiconductor physics

1.研究了强磁场下稀磁半导体量子结构中的双激子态。单重态双激子的不稳定性已被观察到的第一次在非常高的磁场下有效地诱导通过稀释的磁势垒的交换相互作用，而自旋三重态双激子增加其稳定性。采用扩散蒙特-卡罗方法模拟了界面处的单层涨落，计算了双激子的结合能，与实验结果吻合较好。2.结合磁光致发光测量和磁极化子理论模型，研究了稀磁半导体量子结构中激子的局域化机制。阐明了极化子效应引起的激子分岔。3.通过磁致发光研究发现，在高压和极强磁场下，稀磁量子威尔斯中存在着巨大的塞曼位移。用界面δ势模型对结果进行了很好的解释。4.在稀磁量子威尔斯阱中实现的高密度二维电子气系统中，可以观察到自旋极化的带电激子。我们的磁吸收和光致发光测量的分析，导致我们的理解的自旋极化带电激子的创建和重组机制，在这样的高电子密度制度。

1.Biexciton states realized in diluted magnetic semiconductor quantum structures have been investigated under high magnetic field. The destabilization of a singlet biexciton has been observed for the first time under extremely high magnetic field effectively induced by the exchange interaction through the diluted magnetic barrier, whereas a spin triplet biexciton increases its stability. A diffusion Monte-Carlo simulation taking monolayer fluctuation at the interface into account has been performed to evaluate the binding energies of the biexciton, which agreed well with the observation.2.The exciton localization mechanisms in the dilute magnetic semiconductor quantum structure have been studied both magneto-photoluminescence measurements and theoretical magnetic polaron model. It has been clarified that an exciton bifurcation takes place caused by the polaron effect.3.Enormous Zeeman shifts in diluted magnetic quantum wells have been observed by the magneto-luminescence study under high pressure and extremely high magnetic field. The results have been well accounted for by the interface δ-potential model. We have henceforth proposed the method of extracting monolayer magnetism at the hetero-interface in the dilute magnetic semiconductor hetero structures.4.We could observe spin polarized charged excitons in high density two-dimensional electron gas system realized in the diluted magnetic quantum wells. Our analysis of the magneto-absorption and photo-luminescence measurements has led our comprehension of the creation and recombination mechanisms of the spin polarized charged excitons at such high electron density regime.