标题： 二维范德华磁性半导体CrSBr中的巨大磁激子效应 显示英文标题

标题： Colossal magneto-excitonic effects in 2D van der Waals magnetic semiconductor CrSBr

摘要： 二维磁性半导体，其本质是在紧密束缚的电子-空穴对（激子）上耦合了丰富的磁有序景观，为研究原子尺度上的光学和磁性现象之间的相互作用提供了一个令人兴奋的平台。 在这些系统中，磁光效应的强度决定了磁性属性可以被揭示的程度。 在这里，我们报告了在二维磁性半导体CrSBr中观察到的显著强烈的磁激子效应，这使得以前所未有的灵敏度探测其磁有序成为可能。 通过研究高于基本激子能量的光学跃迁，我们在施加磁场的情况下发现了一个巨大的光谱偏移，接近100 meV——比之前观测到的磁激子响应大一个数量级。 我们的综合磁光实验结合详细的密度泛函理论计算表明了表现出这种有趣行为的跃迁的可能起源。 这些发现为在新可及的范围内利用磁激子现象开辟了途径，使以前受弱磁响应限制的新颖光电自旋电子应用成为可能。 显示英文摘要

摘要： 2D magnetic semiconductors, which intrinsically couple a rich landscape of magnetic orders with tightly bound electron-hole pairs (excitons), present an exciting platform to investigate the interplay between optical and magnetic phenomena at the atomic scale. In such systems, the strength of magneto-optical effects determines how deeply the magnetic properties can be revealed. Here, we report the observation of remarkably strong magneto-excitonic effects in the 2D magnetic semiconductor CrSBr that allow probing its magnetic order with unprecedented sensitivity. By investigating optical transitions above the fundamental exciton energy, we discover a massive spectral shift approaching 100 meV under applied magnetic fields - an order of magnitude larger than previously observed magneto-excitonic responses. Our comprehensive magneto-optical experiments accompanied by detailed DFT calculations indicate the possible origin of the transitions exhibiting such intriguing behavior. These findings open avenues for exploiting magneto-excitonic phenomena at newly accessible regimes, enabling novel opto-spintronic applications previously limited by weak magnetic responses.