Spin-dependent photogalvanic effect (PGE) in low-dimensional magnetic systems has recently attracted intensive attention. Based on first-principle transport calculations and symmetry analyses, we propose a robust scheme to generate pure spin current by PGE in centrosymmetric materials with spin polarization antisymmetry. As a demonstration, the idea is successfully applied to a photoelectric device constructed with a zigzag graphene nanoribbon (ZGNR), which has intrinsic antiferromagnetic coupling between the two edges and spin degenerate band structure. It suggests that spin splitting is not a prerequisite for pure spin current generation. More interestingly, by further introducing external transverse electric fields to the two leads to lift the spin degeneracy, the device may behave multifunctionally, capable of producing fully spin-polarized current or pure spin current, depending on whether the fields in the two leads are parallel or antiparallel. Very importantly, our scheme of pure spin current generation with PGE is not limited to ZGNR and can be extended to other two-dimensional (2D) centrosymmetric magnetic materials with spin polarization antisymmetry, suggesting a promising category of 2D platforms for PGE-based pure spin current generation.

低维磁系统中自旋相关的光电流效应（PGE）最近引起了广泛的关注。在第一性原理输运计算和对称性分析的基础上，我们提出了一种鲁棒的方案，可以通过PGE在具有自旋极化反对称性的中心对称材料中生成纯自旋电流。作为演示，该想法已成功应用于由之字形石墨烯纳米带（ZGNR）构造的光电器件，该器件在两个边缘之间具有固有的反铁磁耦合，并且具有自旋简并能带结构。这表明自旋分裂不是产生纯自旋电流的先决条件。更有趣的是，通过向两个引线进一步引入外部横向电场以提升自旋简并性，该设备可以发挥多种功能，能够产生完全自旋极化电流或纯自旋电流的能力，具体取决于两条引线中的电场是平行还是反平行。非常重要的是，我们用PGE产生纯自旋电流的方案不仅限于ZGNR，而且可以扩展到具有自旋极化反对称性的其他二维（2D）中心对称磁性材料，这表明基于PGE的纯自旋有希望的2D平台类别目前这一代。