论文标题
范德华（Van der Waals）的Terahertz磁和晶格激发Ferromagnet VI3
Terahertz Magnetic and Lattice Excitations in van der Waals Ferromagnet VI3
论文作者
论文摘要
我们将红外，Terahertz和拉曼光谱镜的协同作用与DFT计算一起阐明VI3的磁性和晶格性能。 TS1 = 79 K处的结构过渡伴随着极性声子模式的大量分裂。在TS1以下，观察到强烈的铁磁波动。通过磁弹性耦合诱导的55 K频率的变化通过自旋轨道相互作用增强，表明远程铁磁顺序的接近度。在TC = 50 K以下，同时出现了两种拉曼模式，并在第二结构过渡的温度TS2周围显示与订单级磁相变的狭窄间隔中的急剧软化。在TS2以下，Raman光谱中出现了THZ范围内的镁。在VI3中观察到的THZ磁蛋白表明2D Van der Waals Ferromagnets在Ultrafast Thz Spintronics中的施用电位，以前已被视为抗fiferromagnets的独家域。
We use the synergy of infrared, terahertz, and Raman spectroscopies with DFT calculations to shed light on the magnetic and lattice properties of VI3. The structural transition at TS1 = 79 K is accompanied by a large splitting of polar phonon modes. Below TS1, strong ferromagnetic fluctuations are observed. The variations of phonon frequencies at 55 K induced by magnetoelastic coupling enhanced by spin-orbit interaction indicate the proximity of long-range ferromagnetic order. Below TC = 50 K, two Raman modes simultaneously appear and show dramatic softening in the narrow interval around the temperature TS2 of the second structural transition associated with the order-order magnetic phase transition. Below TS2, a magnon in the THz range appears in Raman spectra. The THz magnon observed in VI3 indicates the application potential of 2D van der Waals ferromagnets in ultrafast THz spintronics, which has previously been considered an exclusive domain of antiferromagnets.
