Artificial spin superstructures in semimagnetic CdTe/CdMnTe heterostructures

CdTe/CdMnTe基二维电子系统2DES具有有趣的输运性质，这是由于2DES中电子之间的强sp-d交换相互作用和锰的局域磁矩。这导致了自旋向上和自旋向下的电子之间的巨大自旋分裂。在这里，我们计划使用世界上最好的Cd（Mn）Te材料来探索新机制中的传输：具有自旋超结构的电子的传输，该自旋超结构由空间周期性磁场引起。空间周期性磁场通过铁磁金属（例如，镝或铁）的纳米图案化条带产生。除了标准方法外，还通过探索量子霍尔铁磁体制度和分数量子霍尔制度中的磁阻异常来测试2DES的质量。这本身是有趣的，因为半磁半导体中分数量子霍尔效应的研究迄今尚未探索。

CdTe/CdMnTe based two-dimensional electron systems 2DES have interesting transport properties owing to the strong sp-d exchange interaction between the electrons in the 2DES and the localized magnetic moments of manganese. This gives rise to a giant spin splitting between spin-up and spin-down electrons. Here we plan to use the world-wide best available Cd(Mn)Te material to explore transport in a novel regime: Transport of electrons having a spin-superstructure which gets induced by a spatially periodic magnetic field. The spatially periodic magnetic field is generated by means of nanopatterned stripes of ferromagnetic metal (e.g. Dysprosium or Iron). The quality of the 2DES is tested – besides standard methods – by exploring magnetoresistance anomalies in the quantum Hall ferromagnet regime and the fractional quantum Hall regime. This is interesting in itself as the investigation of the Fractional Quantum Hall Effect in semimagnetic semiconductors is so far unexplored.