论文标题
大型交叉偏振拉曼信号在CRI $ _3 $中：一项第一原理研究
Large cross-polarized Raman signal in CrI$_3$: A first-principles study
论文作者
论文摘要
我们发现与实验一致，发现$ _ {\ rm g} $ phonon模式的异常大的交叉偏振（和反对称）拉曼签名与实验一致。仅当在协同中考虑以下三个效果时，该信号才存在：对CR原子，自旋轨道相互作用和谐振效果的铁磁作。令人惊讶的是，我们发现相关的自旋轨道相互作用电位来自碘原子，尽管磁性主要在铬原子上。我们将拉曼签名分析是磁性的函数，用于拉曼散射的光的磁矩，能量和极化以及载体寿命。除了强烈的交叉偏度拉曼信号外，我们还发现CRI $ _3 $中的异常强的声子调制了磁光kerr效应（moke）。
We find unusually large cross-polarized (and anti-symmetric) Raman signature of A$_{\rm g}$ phonon mode in CrI$_3$, in agreement with experiments. The signal is present only when the following three effects are considered in concert: ferromagnetism on Cr atoms, spin-orbit interaction, and resonant effects. Somewhat surprisingly, we find that the relevant spin-orbit interaction potential originates from iodine atoms, despite magnetism being mostly on chromium atoms. We analyze the Raman signature as a function of magnetic order, the direction of the magnetic moment, energy and polarization of light used for Raman scattering, as well as carrier lifetime. In addition to a strong cross-polarized Raman signal, we also find unusually strong phonon modulated magneto-optical Kerr effect (MOKE) in CrI$_3$.
