Abstract

Mechanisms that are responsible for the optical harmonics generation at exciton transitions are analyzed in several classes of materials. In the cubic GaAs semiconductor, the magneto-induced optical second-harmonic generation second optical harmonic is observed in the region of orbital quantization of the valence and conduction bands. An unusually strong amplitude of the optical third-harmonic generation in an external magnetic field in the region of 1s exciton due to exciton–polariton resonance is found. The optical second-harmonic generation due to 1s, 2s, and 2p exciton resonances in a magnetic field is revealed in a hexagonal wide band-gap ZnO semiconductor. Depending on the symmetry of the exciton states, the mechanisms of the optical second-harmonic generation involve the spin and orbital Zeeman effects, and the magneto-Stark effect. The magneto-induced contribution to second harmonic generation (SHG) in the region of exciton transitions in the Cr₂O₃ antiferromagnet placed in an external magnetic field is studied.

中文翻译：

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激子产生光谐波时的磁场效应

摘要

在几种材料中分析了在激子跃迁中产生光谐波的机理。在立方砷化镓半导体中，在价带和导带的轨道量化区域中观察到磁感应产生的第二谐波产生的第二光学谐波。发现由于激子-极化子共振，在1 s激子范围内的外部磁场中，光学三次谐波产生异常强的振幅。1 s，2 s和2 p导致的光学二次谐波产生六角形宽带隙ZnO半导体揭示了磁场中的激子共振。取决于激子态的对称性，光学第二谐波产生的机理包括自旋和轨道塞曼效应以及磁斯塔克效应。研究了放置在外部磁场中的Cr ₂ O ₃反铁磁体中激子跃迁区域中磁感应对二次谐波产生（SHG）的贡献。