二次谐波产生的磁环非互易性
Magneto-toroidal nonreciprocity of second harmonic generation
摘要：
洛伦兹互易原理是一个基本概念，它支配着光在零磁场中的任何光学线性介质中的传播。在这里，我们在实验上证明了一种新的机制，在非线性光学由环矩驱动的互易性破缺。使用高分辨率飞秒光谱在磁电反铁磁CuB $_2$ O $_4$的光电子共振，我们表明，通过控制的相干源的二次谐波产生的环形自旋顺序，施加的磁场，和非中心对称的晶体结构的非线性干扰，我们诱导一个巨大的非互易性接近100%相反的磁场。基于磁对称性和晶体对称性的理论分析证实了实验结果。这些发现为电子和磁结构的非线性物理学开辟了新的自由度，并为未来在飞秒时间尺度上运行的非互易自旋光电子器件铺平了道路。
英文摘要：
The Lorentz reciprocity principle is a fundamental concept that governs light propagation in any optically linear medium in zero magnetic field. Here, we demonstrate experimentally a novel mechanism of reciprocity breaking in nonlinear optics driven by the toroidal moment. Using high-resolution femtosecond spectroscopy at optical electronic resonances in the magnetoelectric antiferromagnet CuB$_2$O$_4$, we show that by controlling the nonlinear interference of coherent sources of second harmonic generation originating from the toroidal spin order, applied magnetic field, and noncentrosymmetric crystal structure, we induce a huge nonreciprocity approaching 100% for opposite magnetic fields. The experimental results are corroborated by a convincing theoretical analysis based on the magnetic and crystal symmetry. These findings open new degrees of freedom in the nonlinear physics of electronic and magnetic structures and pave the way for future nonreciprocal spin-optronic devices operating on the femtosecond time scale.
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