Marques-Moros Francisco, Boix-Constant Carla, Mañas-Valero Samuel, Canet-Ferrer Josep, Coronado Eugenio
Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980, Paterna, Spain.
ACS Nano. 2023 Jul 25;17(14):13224-13231. doi: 10.1021/acsnano.3c00375. Epub 2023 Jul 13.
The van der Waals semiconductor metamagnet CrSBr offers an ideal platform for studying the interplay between optical and magnetic properties in the two-dimensional limit. Here, we carried out an exhaustive optical characterization of this material by means of temperature- and magnetic-field-dependent photoluminescence (PL) on flakes of different thicknesses down to the monolayer. We found a characteristic emission peak that is quenched upon switching the ferromagnetic layers from an antiparallel to a parallel configuration and exhibits a temperature dependence different from that of the peaks commonly ascribed to excitons. The contribution of this peak to the PL is boosted around 30-40 K, coinciding with the hidden order magnetic transition temperature. Our findings reveal the connection between the optical and magnetic properties via the ionization of magnetic donor vacancies. This behavior enables a useful tool for the optical reading of the magnetic states in atomically thin layers of CrSBr and shows the potential of the design of 2D heterostructures with magnetic and excitonic properties.
范德华半导体超磁体CrSBr为研究二维极限下光学性质与磁性质之间的相互作用提供了一个理想平台。在此，我们通过对不同厚度直至单层的薄片进行温度和磁场相关的光致发光（PL），对这种材料进行了详尽的光学表征。我们发现了一个特征发射峰，当铁磁层从反平行配置切换到平行配置时该峰被淬灭，并且其温度依赖性不同于通常归因于激子的峰。该峰对PL的贡献在30 - 40 K左右增强，这与隐藏序磁转变温度一致。我们的研究结果揭示了通过磁性施主空位的电离实现光学性质与磁性质之间的联系。这种行为为在原子级薄的CrSBr层中光学读取磁态提供了一种有用工具，并展示了具有磁性和激子性质的二维异质结构设计的潜力。
