发表机构
Shanghai University（上海大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出通过相干声子移除自旋层对称操作，在二维自旋简并反铁磁体中激活隐藏非常规磁性，并利用泵浦场偏振编程自旋劈裂织构与热电自旋电流。
AI 中文摘要
自旋简并反铁磁体可以在其晶格自由度中承载隐藏的非常规磁性。我们证明，相干声子通过移除在平衡态下强制能带简并的自旋层操作（而不改变共线奈尔序）来激活这种磁性。泵浦电场的频率和偏振选择共振的Γ点光学声子，并在二重态内选择其坐标方向。这一选择决定了残余的自旋层对称性。在单层MnPSe$_3$中，$A_{2u}$模式产生在质量加权声子坐标$Q$中为奇函数的$i$波劈裂，在$Q\to-Q$下符号反转，而同一双重简并$E_u$二重态的两个正交方向在共同共振处产生$d$波和$s$波劈裂。因此，旋转面内泵浦场$\bm E_\parallel$可以编程自旋劈裂织构和热电自旋电流，连续调节横向纯自旋电流与纵向自旋极化电流之间的响应。二维共线自旋层群的完整分类确定了移除简并强制操作并激活此类非常规磁性的Γ点坐标。
英文摘要
Spin-degenerate antiferromagnets can host hidden unconventional magnetism in their lattice degrees of freedom. We show that coherent phonons activate this magnetism by removing the spin-layer operations that enforce equilibrium band degeneracy without changing the collinear Néel order. The frequency and polarization of a pump electric field select a resonant \(Γ\)-point optical phonon and, within a doublet, its coordinate direction. This choice fixes the residual spin-layer symmetry. In monolayer MnPSe$_3$, an \(A_{2u}\) mode produces \(i\)-wave splitting odd in the mass-weighted phonon coordinate $Q$, reversing sign under $Q\to-Q$, whereas two orthogonal directions of the same doubly degenerate \(E_u\) doublet produce \(d\)- and \(s\)-wave splitting at a common resonance. Rotating the in-plane pump field \(\bm E_\parallel\) therefore programs both the spin-splitting texture and the thermoelectric spin current, continuously tuning the response between transverse pure-spin and longitudinal spin-polarized currents. A complete classification of two-dimensional collinear spin layer groups identifies the \(Γ\)-point coordinates that remove the degeneracy-enforcing operations and activate such unconventional magnetism.
