论文标题
第二次谐波的磁性螺旋非核心
Magneto-toroidal nonreciprocity of second harmonic generation
论文作者
论文摘要
洛伦兹互惠原理是一个基本概念，它控制着零磁场中任何光学线性介质中的光传播。在这里，我们在实验上证明了通过环形矩驱动的非线性光学器件中互惠破坏的新型机制。使用高分辨率的飞跃光谱镜检查在磁电抗抗铁磁铁中的光学共振，$ _2 $ _2 $ o $ _4 $，我们表明，通过控制第二次谐波生成的相干干扰，从圆环旋转序列起源于旋转磁场，并构造了100％的巨大晶体构造，我们的第二次谐波产生的非线性干扰源磁场。通过基于磁对称性和晶体对称性的令人信服的理论分析来证实实验结果。这些发现在电子和磁性结构的非线性物理学中开放了新的自由度，并为在飞秒时尺度上运行的将来的非重生自旋旋转式设备铺平了道路。
The Lorentz reciprocity principle is a fundamental concept that governs light propagation in any optically linear medium in zero magnetic field. Here, we demonstrate experimentally a novel mechanism of reciprocity breaking in nonlinear optics driven by the toroidal moment. Using high-resolution femtosecond spectroscopy at optical electronic resonances in the magnetoelectric antiferromagnet CuB$_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.
