电信波长下的非互易方向二色性
Nonreciprocal directional dichroism at telecom wavelengths
AI总结：
结合磁光光谱与第一性原理计算，揭示了极性手性磁体Ni$_3$TeO$_6$在环向几何结构中的非互易方向二色性，实现了电信全波长范围的确定性控制，将推动相关光子学应用发展。
摘要：
具有超低对称性和自旋-轨道耦合的磁电材料以展现出许多显著特性而闻名，其中包括非互易方向二色性。作为一种极性手性磁体，Ni$_3$TeO$_6$ 预计能在三种根本不同的构型中展现出该效应，尽管目前仅有两种构型得到了实验验证。受揭示这种独特光与物质相互作用的结构-性质关系的启发，我们结合了磁光光谱学和第一性原理计算，揭示了环向几何结构中的非互易性，并将我们的发现与手性构型进行了比较。我们发现，Ni 环向矩的形成是导致 1.1 eV 附近出现最大效应的原因——这一趋势被我们的微观模型和计算实现所捕捉。同时，我们展示了对 Ni$_3$TeO$_6$ 在整个电信波长范围内非互易方向二色性的确定性控制。这一发现将加速利用不寻常对称性特性的光子学应用的发展。
英文摘要：
Magnetoelectrics with ultra-low symmetry and spin-orbit coupling are well known to display a number of remarkable properties including nonreciprocal directional dichroism. As a polar and chiral magnet, Ni$_3$TeO$_6$ is predicted to host this effect in three fundamentally different configurations, although only two have been experimentally verified. Inspired by the opportunity to unravel the structure-property relations of such a unique light-matter interaction, we combined magneto-optical spectroscopy and first-principles calculations to reveal nonreciprocity in the toroidal geometry and compared our findings with the chiral configurations. We find that formation of Ni toroidal moments is responsible for the largest effects near 1.1 eV - a tendency that is captured by our microscopic model and computational implementation. At the same time, we demonstrate deterministic control of nonreciprocal directional dichroism in Ni$_3$TeO$_6$ across the entire telecom wavelength range. This discovery will accelerate the development of photonics applications that take advantage of unusual symmetry characteristics.
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