Gyrotropic birefringence via electromagnon resonance in a multiferroic of spin origin
Gyrotropic birefringence via electromagnon resonance in a multiferroic of spin origin
复制标题
DOI：
10.1103/physrevresearch.2.023345
复制
发表时间：
2020-06-16
影响因子：
4.2
通讯作者：
Takahashi, Y.
中科院分区：
文献类型：
--
作者：
Ogino, M.;Kaneko, Y.;Takahashi, Y.
我们用时间域太赫兹偏振法研究了自旋摆线有序多铁锰氧化物中动态磁电耦合引起的回转双折射(GB)，这是一种与光传播方向有关的非互易双折射响应。Gb在电磁波共振上表现为增强的非互易旋光。通过自旋翻转与磁场的依赖关系，发现GB的大小与铁性序参数P中心点M(P：电极化，M：磁化强度)的双线性耦合成比例关系。定量光谱分析表明，电磁振子的模间耦合和反铁磁共振对磁强子的增强起着至关重要的作用。
We investigate the gyrotropic birefringence (GB) that is a light-propagation-direction-dependent nonreciprocal response of birefringence, arising from the dynamical magnetoelectric coupling in a multiferroic manganite with spin-cycloid order in terms of time-domain terahertz polarimetry. The GB shows up as the enhanced nonreciprocal optical rotation on electromagnon resonance. The magnitude of the GB is found to scale with the bilinear coupling of ferroic order parameters P center dot M (P: electric polarization, M: magnetization) through the magnetic-field dependence with spin-flop transition. Quantitative spectral analysis reveals that the intermode coupling of electromagnon and antiferromagneic resonance plays an essential role for the enhancement of the GB.