单层到介观尺度的二维CrI3光学性质调制：通过高光谱显微镜成像
Monolayer-to-mesoscale modulation of the optical properties in 2D CrI3 mapped by hyperspectral microscopy
AI总结：
本研究利用高光谱宽场成像，揭示了二维磁性材料CrI3中复介电函数随厚度从单层到介观尺度的非单调变化，并关联其层依赖磁性，为磁光效应调控提供关键依据。
摘要：
磁性二维材料有望改变单向光子器件的小型化范式。然而，这些材料在器件中的集成取决于对单层极限下光学性质的精确测定，而这一测定目前仍然缺失。通过使用高光谱宽场成像，我们揭示了典型磁性二维材料CrI3中复光学介电函数随厚度的非单调依赖关系，该关系跨越不同长度尺度：在介观尺度开始变化，在纳米尺度达到峰值，并在单层尺度再次减小。这些结果描绘了材料电子性质的改变，并与CrI3中依赖层数的磁性相一致，为这一材料中长期存在的结构难题提供了线索。从单层到超过100层的复介电函数的独特调制，将有助于理解和操纵磁性二维材料的磁光效应。
英文摘要：
Magnetic 2D materials hold promise to change the miniaturization paradigm of unidirectional photonic components. However, the integration of these materials in devices hinges on the accurate determination of the optical properties down to the monolayer limit, which is still missing. By using hyperspectral wide-field imaging we reveal a non-monotonic thickness dependence of the complex optical dielectric function in the archetypal magnetic 2D material CrI3 extending across different length scales: onsetting at the mesoscale, peaking at the nanoscale and decreasing again down to the single layer. These results portray a modification of the electronic properties of the material and align with the layer-dependent magnetism in CrI3, shedding light into the long-standing structural conundrum in this material. The unique modulation of the complex dielectric function from the monolayer up to more than 100 layers will be instrumental for understanding and manipulating the magneto-optical effects of magnetic 2D materials.
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