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arXiv 2409.06167cond-mat.mes-hallcond-mat.mtrl-sci
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二维 Rashba 交变磁体中的螺旋度控制自旋霍尔角

Helicity controlled spin Hall angle in the 2D Rashba altermagnets

Weiwei Chen, Longhai Zeng, W. Zhu

AI总结:

该研究基于量子线性响应理论分析二维 Rashba 交变磁体,揭示自旋—轨道与交变磁交换作用可在能带交叉点以下显著增强自旋霍尔角。

摘要:

我们研究了二维 Rashba 交变磁体中的电荷—自旋转换效率,这类材料融合了铁磁体和反铁磁体的特征。利用量子线性响应理论,我们量化了该体系中的纵向电导率和自旋霍尔电导率,并证明在能带交叉点以下,通过相对论性自旋—轨道相互作用与非相对论性交变磁交换相互作用的双重效应,自旋霍尔角获得显著增强。此外,我们发现偏斜散射和与拓扑相关的内禀机制在该体系中几乎可以忽略,这与传统铁磁 Rashba 体系形成对比。我们的发现不仅增进了对 Rashba 交变磁体中自旋动力学的理解,也为通过精细控制非共面面内自旋织构和共面面外自旋织构来操控电荷—自旋转换的新策略铺平了道路。

英文摘要:

We investigate the efficiency of charge-to-spin conversion in two-dimensional Rashba altermagnets, a class of materials that merge characteristics of both ferromagnets and antiferromagnets. Utilizing quantum linear response theory, we quantify the longitudinal and spin Hall conductivities in this system and demonstrate that a substantial enhancement of the spin Hall angle is achieved below the band crossing point through the dual effects of relativistic spin-orbit interaction and nonrelativistic altermagnetic exchange interaction. Additionally, we find that skew scattering and topology-related intrinsic mechanisms are almost negligible in this system, which contrasts with conventional ferromagnetic Rashba systems. Our findings not only advance the understanding of spin dynamics in Rashba altermagnets but also pave the way for novel strategies in manipulating charge-to-spin conversion via the sophisticated control of noncollinear in-plane and collinear out-of-plane spin textures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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