多层CrSBr中磁构型与开关的激子指纹
Excitonic fingerprints of magnetic configurations and switching in multilayer CrSBr
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中文总结 AI 辅助
本研究以磁性半导体CrSBr为对象，利用体激子与表面激子的能量及振子强度差异作为磁构型与开关路径的指纹，实现了4层和5层CrSBr磁有序转变过程的灵敏探测。
中文摘要 AI 辅助
电子态与磁性之间的耦合为光学读取和控制磁信息提供了途径。在磁性半导体CrSBr中，激子与磁有序耦合，使其光学响应对基础磁化强度敏感。本文表明，体激子和表面激子的能量与振子强度为磁构型和开关路径提供了独特的光谱指纹。我们区分了两种磁化反转：畴壁介导的反转表现为畴壁扫过光学光斑时的连续光谱演化，而另一种是突变的大面积磁化反转。利用得到的激子指纹，我们重构了4层和5层CrSBr从铁磁序向反铁磁序转变过程中的连续磁构型。我们还发现，对磁有序的敏感性强烈依赖于激子：低能激子可分辨中间构型和与表面相关的构型，而高能激子主要表现为铁磁与反铁磁共振之间的振子强度转移。这些结果确立了激子光谱学作为层状磁性半导体中层依赖磁构型及其开关路径的灵敏探针。
英文摘要
The coupling between electronic states and magnetism provides a route towards optical readout and control of magnetic information. In the magnetic semiconductor CrSBr, excitons are coupled to magnetic order, making their optical response sensitive to the underlying magnetization. Here, we show that the energy and oscillator strength of bulk and surface excitons provide distinct spectroscopic fingerprints of magnetic configurations and switching pathways. We distinguish domain-wall-mediated magnetization reversal, manifested by continuous spectral evolution as a domain wall traverses the optical spot, from abrupt, large-area magnetization reversal. Using the resulting excitonic fingerprints, we reconstruct successive magnetic configurations in 4- and 5-layer CrSBr during the transition from ferromagnetic to antiferromagnetic order. We further find that the sensitivity to magnetic order is strongly exciton-dependent: low-energy excitons resolve intermediate and surface-related configurations, whereas a higher-energy exciton predominantly exhibits a transfer of oscillator strength between ferromagnetic and antiferromagnetic resonances. These results establish excitonic spectroscopy as a sensitive probe of layer-dependent magnetic configurations and their switching pathways in layered magnetic semiconductors.
