中心对称磁性半导体EuTe和EuSe中的自旋诱导光学二次谐波
Spin-induced optical second harmonic generation in the centrosymmetric magnetic semiconductors EuTe and EuSe
摘要：
中心对称磁性半导体EuTe和EuSe的光谱显示，在2.1-2.4eV的带隙附近的自旋诱导光学二次谐波产生（SHG）。的磁场和温度依赖性表明，由于一种新型的非线性光学磁化率的磁偶极子贡献结合自发或感应磁化引起的材料的大部分产生的SHG。这种自旋诱导的磁化率打开了一个广泛的类中心对称系统的谐波产生光谱。
英文摘要：
Spectroscopy of the centrosymmetric magnetic semiconductors EuTe and EuSe reveals spin-induced optical second harmonic generation (SHG) in the band gap vicinity at 2.1-2.4eV. The magnetic field and temperature dependence demonstrates that the SHG arises from the bulk of the materials due to a novel type of nonlinear optical susceptibility caused by the magnetic dipole contribution combined with spontaneous or induced magnetization. This spin-induced susceptibility opens access to a wide class of centrosymmetric systems by harmonics generation spectroscopy.
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