Study of high density excitation magneto-optical phenomena in semiconductor nano-structures

系统地研究了ZnSe或CdS/ZnSe Ⅱ型威尔斯量子阱中带边的高效光致发光。带电激子和/或它们的高密度态被认为是强发光的可能来源。我们在稀磁半导体量子阱威尔斯中进行了四波混频测量，观测到了激子-双激子量子拍频。一个负键双激子已经知道增加其振子强度增加磁场，导致一个明显的量子拍。时间分辨的光致发光测量揭示了Mn局域自旋散射的重要性，在系统中的激子和双激子的非平衡动力学统计。研究发现，在稀磁半导体势垒中，Mn离子内光激发引起量子阱中的带电激子跃迁。在n型掺杂稀磁半导体中，量子威尔斯阱、暗和亮三重态电荷 ...更多信息 研究了强磁场作用下的强激子光致发光跃迁。了解了体稀磁半导体中激子磁极化子的动力学过程和光学性质。自陷型本地化，诱导的自旋交换相互作用已阐明的理论比较。飞秒泵浦-探测法拉第旋转也应用于该系统，证实了光生磁序。磁极化子的形成过程也被理解为与自旋动力学的关系。“重整化”效应在自旋相关激子相互作用中起着重要作用。从理论上指出，激子-激子相互作用在很大程度上取决于光子偏振的相对方向和磁场。理论分析已被应用到光子晶体，这是一个候选人实现高密度激发态。高速电子通过由晶体组成的介质球产生的半超级电池辐射的光谱轮廓。少

In ZnSe or CdS/ZnSe type II quantum wells, high efficiency photoluminescence at the band-edge has been investigated systematically. Charged excitons and/or their high density states have been suggested as a possible origin for the strong luminescence., We have performed four-wave-mixing measurements in dilute magnetic semiconductor quantum wells, .which leads to observation of exciton-biexciton quantum beats. An anibonding biexciton has known to increase its oscillator strength on increasing magnetic field, resulted in a pronounced quantum beat. Time-resolved photoluminescence measurements revealed the importance of spin scattering by Mn localized spins for the non-equilibrium dynamical statistics of an exciton and a biexciton in the system. It has been found that a charged exciton transition in a quantum well, is induced by Mn intra-ionic photo-excitation in the dilute magnetic semiconductor barriers. In n-doped dilute magnetic semiconductor, quantum wells, dark and bright triplet cha … More rged exciton photoluminescence transitions have been clarified subjected to a strong magnetic field. Dynamical processes and optical properties of the exciton magnetic polarons .realized in bulk-dilute magnetic semiconductors have been understood. Self-trap type localization ,induced by; a spin exchange interaction has been elucidated in comparison to the theory. Femto-second pump-and-probe Faraday rotation has been applied to the same system, and photo-induced magnetic order has been confirmed. Magnetic polaron formation process has also been understood in relationship to the spin dynamics. The "renormalization" effect plays an important role in the spin dependent exciton interaction. It has been pointed out theoretically that the exciton-exciton interaction depends much on the relative direction of photon polarization and, a rnagnetic field. Theoretical analysis has been applied to a photonic crystal, which is a candidate for realizing a high-density excitation state. Spectral profile of the semi-super cell radiation resulted from a high-speed electron passing through dielectric spheres consisting of the crystal. Less