Femtosecond-manipulation of charge-magnetism coupling in an antiferromagnetic semiconductor (B08*)

我们将研究反铁磁半导体MnTe在超快时间尺度上的电荷-磁耦合。起始点是依赖于亚晶格磁化的带隙，为此将发展一个理论来描述和指导实验。我们将光诱导相干自旋动力学，这将诱导相干动力学（通过电荷-磁耦合）甚至操纵带隙。相反，我们将光学触发带隙的超快动力学，验证自旋响应。我们将通过测量光诱导相变到顺磁态后的弛豫动力学，在飞秒时间尺度上寻找电荷-磁耦合的特征。观察到的电荷和自旋动力学将用最先进的非平衡多体模型来描述。

We will study the charge-magnetism coupling on ultrafast time scales in the antiferromagnetic semiconductor MnTe. Starting point is the band gap depending on the sublattice magnetization for which a theory will be developed to describe and guide experiments. We will photo-induce coherent spin dynamics which should induce coherent dynamics (via the charge-magnetism coupling) and even manipulation of the band gap. Conversely, we will optically trigger ultrafast dynamics of the band gap, verifying a spin response. We will search for signatures of the charge-magnetism coupling on the femtosecond time scale by measuring the relaxation dynamics after optically induced phase transitions to the paramagnetic state. The observed charge and spin dynamics will be described by state-of-the-art nonequilibrium many-body models.