Magneto-optical Study of Zinc-Selenide/Zinc-Iron-Selenide Quantum Wells; A System with Magnetically Tuned Confinement

本文研究了利用分子束环氧化（MBE）技术制备的高质量的硒化锌/硒化锌铁量子阱结构和硒化锌铁薄膜。这些结构具有不寻常的性质，即空穴约束是由外部施加的磁场决定的。这种情况导致了在稀磁半导体中从未观察到的关于不同类型激子的新情况。硒化锌/硒化锌铁系统提供了一个独特的机会来调节量子阱势和控制载流子约束使用外部磁场。磁反射光谱和磁致发光光谱测量将探索该体系的参数空间（层厚、铁浓度、井数）以及对温度和磁场的依赖关系。这些磁光研究也将扩展到掺杂系统。

This research is concerned with studies of zinc-selenide/zinc- iron-selenide quantum well structres and zinc-iron-selenide epilayers of high quality which have been grown by molecular beam epotaxy (MBE) technique. These structures have the unusual property that the hole confinement is determined by an externally applied magnetic field. This situation leads to a novel situation concerning the different types of excitons which has never been observed in a dilute magnetic semiconductor. The zinc-selenide/zinc-iron-selenide system offers a unique opportunity to tune the quantum well potential and control the carrier confinement using an external magnetic field. Magneto- reflectance and magneto-luminescence spectroscopy measurements will be made exploring the parameter space of this system (layer thickness, iron concentration, number of wells) as well as the dependence on temperature and magnetic field. These magneto- optical studies will also be extended to doped systems.