CrI $_3$基磁光子结构中的局域表面电磁波
Localized surface electromagnetic waves in CrI$_3$-based magnetophotonic structures
摘要：
由于强磁各向异性的二维铁磁性最近被证明是稳定的三碘化铬，CrI $_3$，在单层极限。虽然它的特性在很大程度上尚未被探索，但它提供了一个独特的材料特定平台，以揭示其与模式耦合相关的电磁特性。事实上，在存在面外磁化的情况下的三角对称导致电导率张量的非平凡结构，包括非对角项。本文利用对CrI $_3$电导张量的{ \it ab initio}计算结果，研究了CrI $_3$基结构中的表面电磁波局域化.特别是，我们提供了一个估计的临界角对应的表面等离子体极化激元产生的Kretschmann-Raether配置的反射光谱的详细调查，以及不同的碘化铬$_3$层厚度的磁场分布。我们还研究了由两个CrI $_3$层由$_2$间隔物分开形成的双层结构，并表明表面等离子体共振可以在CrI $_3$和空气之间的界面处实现，取决于间隔物的厚度。
英文摘要：
Resulting from strong magnetic anisotropy two-dimensional ferromagnetism was recently shown to be stabilized in chromium triiodide, CrI$_3$, in the monolayer limit. While its properties remain largely unexplored, it provides a unique material-specific platform to unveil its electromagnetic properties associated with coupling of modes. Indeed, trigonal symmetry in the presence of out-of-plane magnetization results in a non-trivial structure of the conductivity tensor, including the off-diagonal terms. In this paper, we study the surface electromagnetic waves localized in a CrI$_3$-based structure using the results of {\it ab initio} calculations for the CrI$_3$ conductivity tensor. In particular, we provide an estimate for the critical angle corresponding to the surface plasmon polariton generation in the Kretschmann-Raether configuration by a detailed investigation of reflectance spectrum as well as the magnetic field distribution for different CrI$_3$ layer thicknesses. We also study the bilayer structure formed by two CrI$_3$ layers separated by a SiO$_2$ spacer and show that the surface plasmon resonance can be achieved at the interface between CrI$_3$ and air depending on the spacer thickness.
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