CrSBr中各向异性色散暗激子动力学的观测
Observation of anisotropic dispersive dark exciton dynamics in CrSBr
AI总结：
本研究利用超高分辨率共振非弹性X射线散射技术，在CrSBr中发现可沿晶体平面双方向传播的最低能量暗激子，揭示了该材料中一维与二维电子行为异常共存的特性。
摘要：
鉴于CrSBr中的多体激子具有高度各向异性的磁光耦合特性，且有望在自旋电子学和磁振子学器件中构建新型光学界面，这类激子正引发研究人员的浓厚兴趣。表征这些电子激发的轨道特征与传播特性，对理解和调控其行为至关重要，但这类信息的获取存在较大难度。超高分辨率共振非弹性X射线散射是一种具备动量分辨能力的技术，可用于解答这些关键问题。我们展示了在Cr L₃边采集的测量结果，其呈现出具有多种自旋-轨道特征的丰富激发谱。尽管这些激发大多表现出局域化特征，但最低能量暗激子的色散关系表明，它能够沿晶体平面内的a和b两个方向传播。这种二维特性令人意外，因为它与电导率以及亮激子的行为形成鲜明对比——后两者均呈现出强烈的一维特性。这一传播型暗激子的发现，揭示了CrSBr中一维与二维电子行为异常共存的特性。
英文摘要：
Many-body excitons in CrSBr are attracting intense interest in view of their highly anisotropic magneto-optical coupling and their potential for novel optical interfaces within spintronic and magnonic devices. Characterizing the orbital character and propagation of these electronic excitations is crucial for understanding and controlling their behavior; however, this information is challenging to access. Ultra-high resolution resonant inelastic x-ray scattering is a momentum-resolved technique that can address these crucial questions. We present measurements collected at the Cr $L_3$-edge which show a rich spectrum of excitations with a variety of spin-orbital characters. While most of these excitations appear to be localized, the dispersion of the lowest energy dark exciton indicates that it is able to propagate along both the $a$ and $b$ directions within the planes of the crystal. This two-dimensional character is surprising as it contrasts with electrical conductivity and the behavior of the bright exciton, both of which are strongly one-dimensional. The discovery of this propagating dark exciton highlights an unusual coexistence of one- and two-dimensional electronic behaviors in CrSBr.
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