论文标题
共线性抗fiferromagnet feps $ _3 $中的高角度动量激发
High-angular momentum excitations in collinear antiferromagnet FePS$_3$
论文作者
论文摘要
我们报告了准二维Van der waals antiferromagnet feps $ _3 $的磁光学研究。我们的测量结果揭示了一种激发，与易于轴抗铁磁体的抗铁磁共振共振模式非常相似，但是，它显示出在施加的磁场中显示出异常的，四倍的Zeeman。我们用$ | s_z | = 4 $多极磁杆（单离子4-MAGNON绑定状态）识别这种激发，这对应于Fe $^{2+} $ ion的单个磁矩的完整逆转。我们认为，具有强磁各向异性的大型自旋材料中多极木凝结可以产生新的外来状态。
We report on magneto-optical studies of the quasi-two-dimensional van der Waals antiferromagnet FePS$_3$. Our measurements reveal an excitation that closely resembles the antiferromagnetic resonance mode typical of easy-axis antiferromagnets, nevertheless, it displays an unusual, four-times larger Zeeman splitting in an applied magnetic field. We identify this excitation with an $|S_z|=4$ multipolar magnon -- a single-ion 4-magnon bound state -- that corresponds to a full reversal of a single magnetic moment of the Fe$^{2+}$ ion. We argue that condensation of multipolar magnons in large-spin materials with a strong magnetic anisotropy can produce new exotic states.
