Investigation of Spin-Dependent Phenomena in Magnetic Semiconductor Based Heterostructures

本研究项目研究了含有稀释磁性半导体（DMS）层（如ZnFeSe或ZnMnSe）的ZnSe基量子阱结构的磁光响应。基于dms的异质结构在半导体量子阱中是独特的，因为层之间的能带偏移可以通过外部磁场的应用连续调谐。该项目还包括制备一项基于锌、锰、铁和硒的新型磁性合金的研究。材料可以看作是两相，一个是布里渊顺磁体，另一个是范弗利克顺磁体。这两相导致了新的磁性行为，可以通过改变温度和外部磁场来调节。这个研究项目涉及新的磁性半导体材料的合成和表征。这些不寻常的材料具有光学特性，当它们被置于磁场中时会发生变化。这些特性为微波和信息存储技术提供了前景。

This research project addresses the magneto-optic response of ZnSe- based quantum well structures incorporating diluted magnetic semiconductor (DMS) layers such as ZnFeSe or ZnMnSe. DMS-based heterostructures are unique among semiconductor quantum wells in that the band offsets between layers can be tuned continuously via the application of an external magnetic field. The project also involves the preparation an study of new magnetic alloys based on zinc, manganese, iron and selenium. The materials can be viewed as two phases, one being a Brillouin paramagnet, the other being a Van Vleck paramagnet. The two phases lead to novel magnetic behavior which can be tuned by varying temperature and the external magnetic field. %%% This research project involves the synthesis and characterization of new semiconducting materials which are also magnetic. These unusual materials have optical properties that vary when they are placed in a magnetic field. These properties offer promise in microwave and information storage technologies.