论文标题
通过拉曼光谱法观察Yttrium-Iron Garnet中Kaplan-Kittel交换共振的Terahertz磁通
Observation of terahertz magnon of Kaplan-Kittel exchange resonance in yttrium-iron garnet by Raman spectroscopy
论文作者
论文摘要
使用线性和圆形偏振光在Yttrium-Iron石榴石单晶上进行反向散射的拉曼光谱研究。发现了Kaplan-Kittel（KK）交换共振的Terahertz（Thz）磁杆，通过光学方法被认为是无法观察到的。 KK Exchange共振在80 K时的频率为7.8-THz频率，并且极化选择规则导致$ A_ {2} $模式的反对称拉曼张量。此外，提出了所有Raman-Active声子模式的分配，$ 3A_ {1G} $，$ 8E_ {G} $和$ 14T_ {2G} $。这项研究将刺激对THZ磁子和声子的耦合的进一步研究，并为朝向THZ验光量铺平道路。
Backscattering Raman spectroscopic investigations were performed on an yttrium-iron garnet single crystal using linearly and circularly polarized light. A terahertz (THz) magnon of the Kaplan-Kittel (KK) exchange resonance was discovered, which had been regarded as unobservable via optical methods. The KK exchange resonance had a 7.8-THz frequency at 80 K, and the polarization selection rule led to an antisymmetric Raman tensor of the $A_{2}$ mode. Moreover, the assignment of all the Raman-active phonon modes, $3A_{1g}$, $8E_{g}$, and $14T_{2g}$, was proposed. This study will stimulate further investigation of the coupling of THz magnons and phonons and pave the way toward THz optomagnonics.
