AI 中文总结
该研究提出以SSH图案堆叠磁性层构建拓扑表面反常磁体，其体相为受PT对称保护的反铁磁体，边界破缺会产生拓扑保护的表面反常磁态，可通过垂直电场检测，为相关研究提供了新平台。
AI 中文摘要
表面反常磁体通过在常规反铁磁体的边界处解锁反常磁自旋分裂，为自旋电子学开辟了新途径，避开了体反常磁体的严格对称性要求。在本研究中，我们提出通过以Su-Schrieffer-Heeger（SSH）图案堆叠磁性层来构建拓扑表面反常磁体。我们表明，系统的体相是受PT对称性保护的具有简并能带的标准反铁磁体，而边界处的局域对称性破缺会产生位于拓扑能隙内的拓扑保护表面反常磁态。此外，我们提出可通过施加垂直电场来实验检测该效应。此外，该方法可轻易推广到不同类型的表面反常磁体。本研究确立了拓扑边界作为表面反常磁体的天然平台，为实现和操控拓扑表面反常磁体提供了独特途径。
英文摘要
Surface altermagnetism opens new avenues in spintronics by unlocking altermagnetic spin-splitting at the boundaries of conventional antiferromagnets, bypassing the strict symmetry requirements of bulk altermagnets. In this work, we propose creating topological surface altermagnet by stacking magnetic layers in a Su-Schrieffer-Heeger pattern. We show that while the bulk of the system is a standard antiferromagnet with degenerate bands protected by $PT$ symmetry, breaking the local symmetry at the boundary gives rise to a topologically protected surface altermagnetic state residing within the topological gap. Furthermore, we propose that this effect can be experimentally detected by applying a perpendicular electric field. Besides, this approach can be readily generalized to surface altermagnetism of different types. Our work establishes topological boundaries as a natural platform for surface altermagnetism, offering a distinct route for realizing and manipulating topological surface altermagnets.
