The Raman study of strongly interacting two-dimensional electron systems based on ZnO/MgZnO has revealed an anomalously intense spectral line of the anti-Stokes component of the spin exciton. This line is manifested near the filling factor v = 2 at the ferromagnetic ordering of the spin subsystem, whereas it is not observed at the paramagnetic ordering. It has been shown that this line can be attributed to the formation of an ensemble of long-lived collective excitations in the ferromagnetic phase at a filling factor of v = 2.

中文翻译：

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反斯托克斯散射信号的异常是量子霍尔效应体系中宏观填充的激子能级的指标

基于ZnO / MgZnO的强相互作用二维电子系统的拉曼研究表明，自旋激子的反斯托克斯分量具有异常强烈的光谱线。这条线在自旋子系统的铁磁有序时表现在填充因子v = 2附近，而在顺磁有序时没有观察到。已经表明，这条线可以归因于在填充因子为v = 2的情况下在铁磁相中形成了长寿命集体激发集合体。