论文标题
CRI3的磁单层中强大的极性子
Robust polaritons in magnetic monolayers of CrI3
论文作者
论文摘要
我们表明，在基于三碘化物（CRI3）的单层（CRI3）的系统中，可以实现强光质耦合与显着磁性的状态。这种二维材料结合了铁磁有序的存在，即使在室温下也可能形成强大的激子复合物。使用显微镜第一原则计算，我们揭示了相当于Wannier-和Frenkel型激子的丰富光谱跃迁，其中包括包含有效质量负质量的电子的光谱。我们表明，具有不同极性化的激子有效地与平面微腔的光子模式融合在一起，并且由于选择特殊的规则，极化模式在圆形极化中得到了很好的解决。激子和空腔限制的非常强的光学振荡器强度的结合导致了大型狂犬分裂的值，单个单层的速度达到了35 MeV，以及在高达20 MeV的极性模式之间分裂的巨型Zeeman分裂。这使CRI3成为磁过滤器应用的绝佳平台。
We show that the regime of strong-light matter coupling with remarkable magnetic properties can be realized in systems based on monolayers of chromium triiodide (CrI3). This two-dimensional material combines the presence of ferromagnetic ordering with the possibility of forming strongly-bound excitonic complexes even at room temperature. Using microscopic first-principle calculations we reveal a rich spectrum of optical transitions, corresponding to both Wannier- and Frenkel-type excitons, including those containing electrons with a negative effective mass. We show that excitons of different polarizations efficiently hybridize with a photonic mode of a planar microcavity, and due to the peculiar selection rules polariton modes become well resolved in circular polarizations. The combination of very strong optical oscillator strength of excitons and cavity confinement leads to large values of the Rabi splitting, reaching 35 meV for a single monolayer, and giant Zeeman splitting between polariton modes of up to 20 meV. This makes CrI3 an excellent platform for magnetopolaritonic applications.
