论文标题
来自4 $ f $ paramagnets的光学驱动性手性声子的巨型有效磁场
Giant effective magnetic fields from optically driven chiral phonons in 4$f$ paramagnets
论文作者
论文摘要
我们提出了一种机制，通过该机制，稀有地铁三甲底型的光学驱动的手性声子模式产生了作用于顺磁性$ 4F $ spins的巨大有效磁场。以三氯化铜（CECL $ _3 $）作为我们的示例系统，我们使用现象学建模和第一原则计算的组合来计算超舒尔特Terahertz脉冲激发的相干声子动力学。我们发现，可能会产生超过100特斯拉的有效磁场，以使旋转极化，以实验可访问的脉冲能。通过改变激光脉冲的圆极化的触极性，可以逆转诱导磁化的方向。基础过程是最近描述的光学替代效应的声子类似物，它可以实现对Terahertz频率下磁性控制和转换磁顺序的新颖方法。
We present a mechanism by which optically driven chiral phonon modes in rare-earth trihalides generate giant effective magnetic fields acting on the paramagnetic $4f$ spins. With cerium trichloride (CeCl$_3$) as our example system, we calculate the coherent phonon dynamics in response to the excitation by an ultrashort terahertz pulse using a combination of phenomenological modeling and first-principles calculations. We find that effective magnetic fields of over 100 tesla can possibly be generated that polarize the spins for experimentally accessible pulse energies. The direction of induced magnetization can be reversed by changing the handedness of circular polarization of the laser pulse. The underlying process is a phonon analog of the inverse Faraday effect in optics that has been described recently, and which enables novel ways of achieving control over and switching of magnetic order at terahertz frequencies.
