AI 中文总结
研究自旋动量锁定能否仅由磁手性产生，通过求解电子与自旋螺旋耦合的最小紧束缚模型，揭示仅磁手性在无自旋轨道耦合时产生自旋极化的机制，建立超越传统范式的手性诱导自旋相关效应的最小精确可解模型。
AI 中文摘要
自旋动量锁定被广泛视为相对论自旋轨道耦合的标志。本文通过分析证明它也可仅由磁手性产生。利用广义布洛赫定理求解电子与自旋螺旋耦合的最小紧束缚模型，表明螺旋产生手性依赖的p波磁性，其特征为反对称自旋纹理\(\boldsymbol{s}(\boldsymbol{k}) = -\boldsymbol{s}(-\boldsymbol{k})\)。精确解还给出了电导率和自旋埃德尔斯坦磁化率的封闭形式表达式，揭示了仅磁手性就能在无自旋轨道耦合时产生自旋极化的微观机制，对手性诱导自旋选择性也有直接影响。在强交换耦合 regime，自旋螺旋的自旋相关物理直接类似于电子通过非磁性螺旋传播的轨道相关物理。我们的工作建立了一个超越传统自旋轨道耦合范式的手性诱导自旋动量锁定和自旋电荷转换的最小精确可解模型。
英文摘要
Spin-momentum locking is widely regarded as a hallmark of relativistic spin-orbit coupling. Here we demonstrate analytically that it can instead emerge solely from magnetic chirality. Solving the minimal tight-binding model of electrons coupled to a spin spiral using a generalized Bloch theorem, we show that the spiral generates chirality-dependent p-wave magnetism characterized by the antisymmetric spin texture $\boldsymbol{s}(\boldsymbol{k})=-\boldsymbol{s}(-\boldsymbol{k})$. The exact solution further yields closed-form expressions for the electrical conductivity and the spin Edelstein susceptibility, revealing a microscopic mechanism by which magnetic chirality alone can generate spin polarization without spin-orbit coupling, with direct implications also for chirality-induced spin selectivity. In the strong exchange-coupling regime, the spin-dependent physics of the spin spiral becomes directly analogous to the orbital-dependent physics of electrons propagating through a non-magnetic helix. Our work establishes a minimal exactly solvable model of chirality-induced spin-momentum locking and spin-charge conversion beyond the conventional spin-orbit coupled paradigm.
Comments6 pages, 4 figures. This work was supported by the EIC Pathfinder OPEN grant 101129641 "Orbital Engineering for Innovative Electronics" and by Deutsche Forschungsgemeinschaft (DFG): Project No. 328545488 - CRC/TRR 227, Project No. B12 and by the German Excellence Strategy -EXC3112/1 -533767171 (Center for Chiral Electronics)
