条纹序交变磁性
Stripe-Order Altermagnetism: Nematic Spin Splitting beyond the $l$-Wave Classification
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中文总结 AI 辅助
研究交变磁性，通过双轨道模型揭示条纹自旋和轨道序相互作用产生新相，强跳跃各向异性下接近半填充时条纹序交变磁性更有利，自旋反转镜可产生纯横向自旋电流用于输运诊断。
中文摘要 AI 辅助
交变磁性将补偿磁序与非相对论性自旋分裂相结合，然而现有机制主要依赖于尼尔序反铁磁体中的自旋反转旋转。在此，我们建立了由自旋反转镜支配的条纹序交变磁性，使其超出了基于旋转的常规l波分类。利用双轨道模型，我们表明条纹自旋和轨道序的相互作用产生两个相：具有镜选向列自旋分裂的条纹交变磁体和具有自旋简并能带的条纹反交变磁体。后者在合适的弯曲结构中可支持类似铁电的自旋分裂电控制。随机相位近似（RPA）计算表明，在强跳跃各向异性下接近半填充时条纹序交变磁性更有利。自旋反转镜进一步为平行或垂直于镜平面的电场强制产生纯横向自旋电流，提供了直接的输运诊断。
英文摘要
Altermagnetism combines compensated magnetic order with nonrelativistic spin splitting, yet established mechanisms predominantly rely on spin-reversing rotations in Néel-order antiferromagnets. Here we establish stripe-order altermagnetism governed instead by a spin-reversing mirror, placing it outside the usual rotation-based $l$-wave classification. Using two-orbital models, we show that the interplay between stripe spin and orbital orders can yield a stripe altermagnet with mirror-constrained nematic spin splitting or a stripe anti-altermagnet with spin-degenerate bands. The latter can support ferroelectric-like electrical control of spin splitting in suitable buckled structures. Random-phase-approximation (RPA) calculations show that stripe-order altermagnetism is favored near half filling under strong hopping anisotropy. The spin-reversing mirror further enforces a purely transverse Drude spin current for an electric field parallel or normal to the mirror plane, while spin-resolved mirror and rotation probes distinguish this response from that of rotation-governed $l$-wave altermagnets.
