通过轨道场诱导的自旋劈裂探测反交替磁性
Probing Antialtermagnetism via Orbital-Field-Induced Spin Splitting
- RIKEN Center for Emergent Matter Science (CEMS)（理化学研究所新兴物质科学中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出利用面内磁场的轨道效应将反交替磁体中隐藏的自旋纹理转化为可观测自旋劈裂，并通过能带求和规则与响应函数识别隐藏磁序参量，无需层分辨率。
AI中文摘要：
层补偿可以在反交替磁体中用自旋简并的体态谱隐藏自旋极化，从而阻碍对潜在磁序的光谱识别。在此，我们表明面内磁场的轨道效应将隐藏的自旋纹理转换为具有相反动量宇称的可观测自旋劈裂，从而恢复光谱可及性。一旦确定了隐藏交换序的宇称，弱场区域中的互补响应函数进一步解析其波特性：在最小模型内，我们说明对诱导能带劈裂的能带求和规则可分离形状因子的动量梯度，并区分隐藏的偶宇称序，而对于奇宇称扇区，诱导的净自旋极化表现出特征性的场幅度和角度依赖性。这些结果确立了轨道场诱导的自旋劈裂作为无需层分辨率即可识别隐藏交替磁序参量的通用途径。
英文摘要：
Layer compensation can conceal spin polarization behind a spin-degenerate bulk spectrum in antialtermagnets, preventing spectroscopic identification of the underlying magnetic order. Here we show that the orbital effect of an in-plane magnetic field converts the hidden spin texture into an observable spin splitting with momentum parity opposite to that of the underlying exchange order, thereby restoring spectroscopic access. Once the parity is determined, complementary response functions in the weak-field regime further resolve its wave character. Within a minimal model, we illustrate that a sum rule over the difference of spectral functions between opposite spins isolates the momentum gradient of the form factor and differentiates hidden even-parity orders, whereas for odd-parity sectors the induced net spin polarization exhibits characteristic field-amplitude and angular dependences. These results establish orbital-field-induced spin splitting as a generic route to identifying the hidden altermagnetic order parameter without layer resolution.
