反铁轴异磁性
Antiferroaxial altermagnetism
AI总结：
本文提出反铁轴异磁性作为普遍存在的多铁机制，通过统一的Landau理论框架，揭示反铁轴序与奈尔向量及异磁序的三线性耦合，实现异磁性的可控开关。
摘要：
反铁轴态正在成为凝聚物质系统中的重要铁电序。本文确立反铁轴异磁性为广泛存在的、通用的、微观基础的多铁机制，其中反铁轴反向旋转畸变既诱导异磁性又使其能确定性和可逆性地切换。在统一的Landau理论和对称性框架内，我们识别了允许的三线性不变耦合反铁轴序、奈尔向量和异磁序，并推导了其出现的一般对称性标准。这种耦合将诱导的异磁性锁定到反铁轴序，使得后者反转会反转自旋分裂及相关的反时间序响应，如异常霍尔电导率。我们提供了实用的自旋群词典，将奈尔向量表示映射到所导致的d-、g-和i-波反铁轴异磁性，并通过配体旋转tight-binding模型和第一性原理计算验证了该机制，并通过筛查MAGNDATA和C2DB数据库识别了许多候选材料。我们的结果将反铁轴性提升到通用的铁电控制开关，用于结构可编程的异磁自旋电子学。
英文摘要：
The antiferroaxial state is emerging as an important ferroic order in condensed matter systems. Here, we establish antiferroaxial altermagnetism as a broadly prevalent, generic, and microscopically grounded multiferroic mechanism, in which antiferroaxial counter-rotating distortions both induce altermagnetism and enable its deterministic and reversible switching. Within a unified Landau-theory and symmetry framework, we identify a symmetry-allowed trilinear invariant coupling the antiferroaxial order, the Néel vector, and the altermagnetic order, and derive general symmetry criteria for its occurrence. This coupling locks the induced altermagnetism to the antiferroaxial order, so that reversing the latter reverses the spin splitting and associated time-reversal-odd responses, such as anomalous Hall conductivity. We provide a practical spin group dictionary mapping Néel-vector representations to the resulting $d$-, $g$-, and $i$-wave antiferroaxial altermagnetism, validate the mechanism with ligand-rotation tight-binding models and first-principles calculations, and identify many candidate materials by screening the MAGNDATA and C2DB databases. Our results elevate antiferroaxiality to a universal ferroic control knob for structurally programmable altermagnetic spintronics.
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