钇铁石榴石Kaplan-Kittel交换共振太赫兹磁振子的拉曼光谱观测
Observation of terahertz magnon of Kaplan-Kittel exchange resonance in yttrium-iron garnet by Raman spectroscopy
摘要：
利用线偏振光和圆偏振光对钇铁石榴石单晶进行了背散射拉曼光谱研究。发现了一种太赫兹（THz）磁振子的Kaplan-Kittel（KK）交换共振，这一直被认为是不可观察的通过光学方法。KK交换共振在80 K时具有7.8 THz的频率，并且偏振选择规则导致$A_{2}$模式的反对称拉曼张量。此外，还对所有的拉曼激活声子模$3A_{1g}$、$8E_{g}$和$14T_{2g}$进行了归属.本研究将促进对太赫兹磁振子和声子耦合的进一步研究，并为太赫兹光磁学的发展铺平道路。
英文摘要：
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.
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