Coherent spin dynamics of carriers and magnetic ions in semiconductor heterostructures

本课题将研究半导体异质结构中磁性离子的自由载流子自旋和局域自旋的相干动力学。基于III-V和II-VI半导体的量子阱，也包括带有磁性Mn2+离子的稀释磁性半导体（DMS），将通过时间分辨泵浦探针克尔旋转、自旋翻转拉曼散射和偏振光致发光进行研究。因此，激子态和三态的共振激发被认为是一个重要的因素。研究的一个关键需求是找出基于ZnSe和GaAs的非磁性结构中特别长寿命的电子和空穴自旋相干性的条件，包括生长取向的作用。在基于ZnMnSe和CdMnTe的DMS结构中，将研究自旋从载流子到磁性离子的相干转移。

In this project the coherent dynamics of free carrier spins and localized spins of magnetic ions in semiconductor heterostructures will be studied. Quantum wells based on III-V and II-VI semiconductors, also including diluted magnetic semiconductors (DMS) with magnetic Mn2+ ions, will be investigated by time-resolved pump-probe Kerr rotation, spin-flip Raman scattering and polarized photoluminescence. Hereby, the resonant excitation of exciton and trion states is regarded as an important factor. A key demand of the studies is to find out the conditions of particularly long-lived electron and hole spin-coherence in nonmagnetic structures based on ZnSe and GaAs, including the role of the growth orientation. In DMS structures based on ZnMnSe and CdMnTe coherent transfer of spin from carriers to magnetic ions will be studied.